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liturgia-diaria - An API for the daily readings in Portuguese. By Danyel.
church-calendar-api - RESTful API providing Roman Catholic church calendar data for your apps. By Jakub Pavlík.
missal-1962 - Python/Flask API, serving calendar and propers for a given day, and Bootstrap UI consuming and presenting the data. By Marcin Molenda.
Liturgical Calendar - A RESTful API generating the liturgical calendar for any year from the General Roman Calendar, adaptable to nations and dioceses, with example clients. By John R. D'Orazio.
calendarium-romanum - Ruby library computing the Roman Catholic liturgical calendar (post-Vatican II); the foundation for church-calendar-api and calrom. By Jakub Pavlík.
catholic-readings-api - Free REST API providing daily Catholic Mass readings, saints, and liturgical calendar data.
tamil-bible-database - Tamil Bible Database in MySQL with PHP API. By Jayarathina Madharasan.
BibleGet - An API for retrieving Bible passages from various editions of the Bible (first and foremost Catholic editions). Various client applications are available too.
catholic-mass-readings - API for querying the daily Catholic Mass readings populated from the USCCB Bible website.
LiturgyDatabase - Swift Package Manager library providing Catholic liturgical readings in Portuguese (daily Gospels, psalms, and Mass prayers), organized by liturgical date and updated periodically. By Rodrigo Soldi.
OpenChurch - Open-data API for Catholic dioceses, parishes, and churches, aggregating data from multiple sources (notably Wikidata) with reliability indicators for app developers. By Hozana.
breviarium--core - Open-source TypeScript library providing the Liturgy of the Hours texts and logic, powering the Breviarium app.
liturgical-calendar-mcp - An MCP server that lets AI agents query the Roman Catholic Liturgical Calendar API. By CatholicOS.
liturgy-day - A REST API for Catholic liturgical queries, providing feast day names, liturgical season, color, and more, self-hosted or via liturgy.day. By Andrew Ensley.
MotivationalAPI - Help people overcome their problems with catholic and secular motivational phrases. By Miguel Gómez.
The-Collection-of-Catholic-Prayers-Api - REST API serving traditional Catholic prayers, the Stations of the Cross, and a 366-day saints feast-day calendar. By Eric Kouassi.
The-Rosary-Api - REST API serving the Catholic daily Rosary prayers, automatically selecting the correct mysteries by liturgical season or weekday tradition. By Eric Kouassi.
liturgy-components-js - Reusable ES6 UI components for building Catholic liturgical-calendar interfaces on the Liturgical Calendar API. By John R. D'Orazio.
caminho-api - A FastAPI service exposing the 999 points of St. Josemaría Escrivá's The Way (Caminho). By Élder Fausto.
lectio-api - REST API for daily Catholic Gospel readings, built with FastAPI. By Pedro Felipe.
catholic_catechism_api - FastAPI service for retrieving paragraphs from the Catechism of the Catholic Church via keyword and semantic (RAG) search, sourced from the Vatican website. By Rodrigo Rangel.
gregorio - Gregorio is a software application for engraving Gregorian Chant scores on a computer.
catebot - Reddit bot that automatically quotes the Catechism of the Catholic Church when cited in comment threads.
lilygabc - LilyPond library for typesetting Gregorian chant scores written in GABC format, enabling direct inclusion of gabc notation in LilyPond documents with support for both modern and square notation. By Jakub Pavlík.
homeassistant-catholic-calendar - Home Assistant custom component adding a Catholic liturgical calendar sensor and calendar entity.
prayer-clock - Qt6 desktop app reminding Catholics to pray the Angelus and the 3 O'clock Prayer. By Allen.
examen-a-confession-app - Windows app guiding Catholics through an examination of conscience to prepare for confession. By William Ryan McDonald.
Evangelizo - provides the daily Gospel readings, prayers, and information about saints online and through an app. Available in many different languages.
Holy Habits - offers a simple and intuitive way to build habits that actually lead you closer to God, individually, or with friends.
Biblia Matos Soares - Android app of Fr. Manuel de Matos Soares's classic 1956 Portuguese translation of the Bible.
Mobile-Apps
DeFide - FOSS Catholic Android app with the Douay-Rheims and Vulgate Bible, guided Rosary, traditional prayers, and a novena tracker. By Tristin Baker.
aelf-flutter - Flutter app for the French Catholic AELF daily readings and liturgy, with offline support. By Nathanaël.
breviar-ios - iOS native app for the Catholic Liturgy of the Hours in Slovak, Czech, and Hungarian, companion to the Liturgia-hodin-online web project. By Akos Gyimesi.
Holy-Bible - Android app for reading the Slovak Catholic Bible translation (Slovenský katolícky preklad), with text licensed from Spolok sv. Vojtecha.
Mariam - meditative rosary app that enables believers to pray the Rosary. By Aldrin Velasco.
breviarium - Offline, lightweight app for the Roman Rite Liturgy of the Hours.
ad-aeternum - Interactive Catholic Rosary app for iOS and Android (React Native/Expo). By Bruno Pimentel.
St. Andrew Novena Mobile App - Flutter app to count daily recitations of the St. Andrew novena prayer, 15 times daily. By Mike Truso.
theochrone-mobile - Mobile companion app (Nuxt 3) to the Theochrone Tridentine liturgical calendar, available on Google Play. By Olaf-Marie Sergent.
biblos - Semantic Bible search and multi-layered analysis, incorporating the Church Fathers' commentaries for historical theological perspective. Demo at biblos.app. By Jon Boldt.
Missale Meum - 1962 Roman Catholic Missal for the Traditional Latin Mass. By Marcin Molenda.
Liturgia Hodín Online - Online Breviary (Liturgy of the Hours) in Slovak, Czech, Hungarian, Latin and Icelandic, running since 2011, with companion mobile apps. By Juraj Vidéky.
Confessit - A progressive web app designed to help Roman Catholics prepare for the sacrament of confession by examining their conscience. By Mike Kasberg.
accenteur - Web tool for automatically accentuating liturgical Latin texts. By Nicolas Bancillon.
US Diocese Mapper - Create interactive and static maps of Latin Rite Catholic dioceses, provinces, and cathedrals within the United States. By Kenneth Burchfiel.
Liturgia de las Horas - Web application presenting the daily texts of the Liturgy of the Hours in Spanish, organized by year from 2015. By Manuel G. Araujo A.
Rosarium - Web application designed to help Catholics pray the Holy Rosary in Latin in an interactive and immersive way through 3D models of Catholic churches generated through photogrammetry. Demo: leozamboni.github.io/Rosarium. By Leonardo.
Domus - Web application designed to visit churches around the world through 3D models generated by photogrammetry. Demo: leozamboni.github.io/Domus. By Leonardo.
marriage-booklet - Web app to help Catholic couples plan and typeset their wedding Mass booklet. By Open Source Catholic.
Augustinus - Web app and CLI that generates GABC Gregorian chant notation from text by applying customizable musical models, with real-time SVG preview and LaTeX output. Demo at augustinus.liturgiacantada.com.br. By AISCGre Brasil.
Oficjum - A progressive web application that provides daily liturgical texts for the Liturgy of the Hours in Polish. Demo at oficjum.starokatolicy.eu. By Anna Wróbel.
catholic-bible-cheatsheet - Digital reference for the Catholic Bible Cheatsheet from Dr. Taylor Marshall with Bible verses
OrdoRomanum - Perpetual liturgical ordo for the Roman Rite, computing the Office, Mass, and feast-day particulars for any date.
TradCatholicQuotes - Traditional Catholic quote collection about the fewness of the saved, the rosary, and the use of Latin.
officium-novum - Modern liturgical engine for the traditional Roman Breviary and Missal, separating data, rubrical logic, and presentation into distinct layers and exposing a JSON API with a web frontend. By Miguel Galvez.
spiritual-bouquet-tracker - Web app to create and share Catholic spiritual bouquets with real-time tracking via a shared link. By Juan Alegría.
Rezo de los Mil Jesús - Web application to assist in the devotion of Los Mil Jesús. By Faber Andrés Vergara Holguín.
sacramentalrecords - Web app for digitally sharing and updating Catholic sacramental records. By Chris Treadaway.
ministryfair - Mobile-first, QR-code-driven web app for parishioners to sign up for ministries at a parish ministry fair, with a Google Sheets backend. By Chris Treadaway.
grantfinder - Tool that helps Catholic churches and schools discover available grants and find the best matches. By Chris Treadaway.
fluent-by-1000 - Interactive Chinese (Traditional) Catholic Bible reader built with Next.js; click any character for in-context AI explanations, plus frequency flashcards for the 1000 most common characters. Demo at fluent-by-1000.vercel.app. By José Álvarez.
miserend.hu - Web platform for searching and viewing Catholic Mass schedules of churches across Hungary, with administrative tools for managing the listings. By Szent József Hackathon.
ejks - Web app and open database for the Slovak Unified Catholic Hymnal (Jednotný katolícky spevník), with community-contributed hymn texts at ejks.sk. By Stanislav Bebej.
Easter dates - Distribution of Easter per Date Across Years, visualized. By Gavin Rehkemper.
OrariMesse - Mass times app for web, curated by the Italian Bishops Conference (C.E.I.) and the affiliate company IDS&Unitelm.
Misas.org - Mass times, lectionary readings and more, in Spanish. By Asociación Eucharistia.
GregoSearch - A modern and powerful search interface for GregoBase, one of the largest databases of Gregorian chant scores.
JGABC Chant Tools - Tools for gregorian chants, including mass propers.
Devocionario - Catholic website in portuguese that provides daily readings and prayers.
OrarioSanteMesse - Mass times app for web, curated by volunteers of the Association Orariosantemesse and technical support from Maestrale Group.
AI Tools
SpiriTools - An open-source, fully offline AI theological assistant for Catholics (by ADIC), grounded in Scripture, scholastic theology and magisterial texts — the digital successor to Ictus Win / Biblia Clerus.
CCC-ai-guide - A locally-run (Ollama) AI assistant that answers questions on the Catholic faith using only the Catechism of the Catholic Church. By Steve Seelan.
Magisterium AI - Magisterium AI taps into a vast database of Church documents utilizing advanced tools to deliver trustworthy answers rooted in Catholic tradition and the Catholic Church's teachings. By Longbeard.
Truthly - Catholic AI app designed to empower people with instant, reliable Catholic answers to questions about the faith and life.
Homily.build - The comprehensive platform for Catholic preachers to create contextual, high-quality homilies efficiently across different audiences and settings.
Catholic AI - AI app by Cristian Augustine offering answers rooted in Catholic teaching, fine-tuned on Catholic sources (Aquinas's Catena Aurea, the Church Fathers, the Catechism), with Bible chat, commentary, and Rosary guides.
Websites
QUMRAN NET - online database of materials for Catholic pastoral care in Italian. By Associazione Qumran.
Wikitolica - A Spanish Catholic encyclopedia with more than 4000 articles, faithful to the Magisterium.
Cathopedia - An Italian Catholic wiki presenting the faith in a pastoral tone, faithful to the Magisterium.
Santi e beati - A website about saints and martyrs. By Francesco Diani.
GCatholic.org - A website with a slew of information about the Catholic Church and its institutions, hierarchy, liturgy, etc. By Gabriel Chow.
Catholic Resources - contains a variety of materials, mostly related to biblical and liturgical studies,
intended for scholars, teachers, students, pastors, believers, seekers, and others interested in the Catholic faith. By Felix Just, S.J.
Siti Cattolici - contains information about Catholic websites in Italy
Miracle's List - St. Carlo's website cataloguing the world's Eucharistic miracles.
Apparitions of Our Lady - St. Carlo's website of Marian apparitions recognized by the Catholic Church.
Catholic Hierarchy - Current and historical data on the bishops and dioceses of the Catholic Church worldwide. By David M. Cheney.
Command Line
romcal - The Liturgical Calendar used by the Roman Rite (Western Church) for Node JS v6 and above.
tridentine_calendar - Python library and CLI for calculating the 1962 Roman Catholic (Tridentine) liturgical calendar. By Joseph Antognini.
gabctk - Command-line toolkit for Gregorian chant GABC files, converting them to MIDI, LilyPond, ABC, and MusicXML formats, with transposition and text-extraction features. By Jacques PERON.
catholic-cli - Command-line tool for easy access to Catholic resources including the Catechism, Canon Law, and the Bible. By Aseem Savio.
roman calendar - Roman Catholic Liturgical Calendar Generator. By Jayarathina Madharasan.
python-curses - Terminal-based Rosary guide written in Python using the curses library.
agape-deus - Daily Catholic Readings in your terminal. By Nicholas Gorden.
ordotools - Python generator for the pre-Vatican II Roman Catholic Ordo. By Fr. Barnes.
Lectio.nvim - Neovim plugin to practice lectio divina. By Nicholas Gorden.
focus-study - A collection of FOCUS Bible studies in booklet format. By Ryan Vanden Bos.
sacra-scriptura - Read the bible in your terminal. By Nicholas Gorden.
bibliaAveMariaJSON - The Catholic Bíblia Ave Maria (a popular Brazilian Portuguese translation) in JSON format.
nocturnale-romanum - Digital typesetting of the Nocturnale Romanum, the Roman Rite chant book for Matins, containing over 1,400 pieces in GABC and TeX, produced by a volunteer steering committee.
summa.json - The Summa Theologica of St. Thomas Aquinas parsed into JSON for easy programmatic access. By Jacob Gray.
vulgate - The Latin Vulgate with full ecclesiastical accent marks, plus a yearly reading plan. By Nicolas Bancillon.
roman calendar - Roman Catholic Liturgical Calendar Generator. By Jayarathina Madharasan.
romanus - The entire Roman Catechism of the Council of Trent
In-adiutorium - Complete musical setting of the Czech translation of the Roman Catholic Liturgy of the Hours, encoded in LilyPond. By Jakub Pavlík.
bible-nabre-json-dataset - The New American Bible Revised Edition (NABRE) in JSON, with the script used to generate it. By Nirmal Benann.
Editio-Sti-Wolfgangi - Liturgical booklets for the Roman Catholic Divine Office with Gregorian chant notation, compiled with LuaTeX and Gregorio. By Jakub Pavlík.
Vesperale-Romanum - The Vesperale Romanum — chant book for Roman Rite Vespers and Compline of the Divine Office — retypeset using Gregorio.
atelier - Chant books and liturgical texts in the Dominican tradition, encoded in TeX and Gregorio, produced by the Atelier St. Jacques. By Fr. Innocent Smith, O.P.
roman-catholic-popes - Comprehensive CC0 dataset of Roman Catholic popes and antipopes in JSON, CSV, and plain text formats. By Brandon Himpfen.
codexcommunion/prayer-collection - A comprehensive collection of traditional Roman Catholic prayers in multiple languages, organized as structured JSON files.
Documentos Catolicos - a collection of various Catholic resources, using PowerShell scripts to generate the archive. By José Cláudio Aguiar.
biblia-wujka - Tools converting the Jakub Wujek Bible (a classic Polish Catholic translation) into OSIS and SWORD formats. By Bartosz Gleń.
CantusCorpus - A versioned dataset of catalogued Gregorian chant records from the Cantus databases. By the DACT project.
Hardware
Catholic Lectionary on ESP8266 - The Roman Catholic Lectionary, Liturgical Calendar and Feast Days on ESP8266 with Waveshare 2.7" or 4.2" red/black display, generic SD card reader and DS3231 clock IC. By Philip Lishman.
Word of the Lord - Pebble smartwatch face showing the time, weather, and the daily Gospel (or quotes from theologians of your choice), with optional Gemini AI summaries.
Tools that are not specifically Catholic (nor broadly Christian/faith) but are commonly relied on in Catholic work — chiefly ecclesiastical Latin.
Whitaker's Words - William Whitaker's WORDS, a command-line Latin dictionary, invaluable for ecclesiastical Latin. By Martin Keegan.
tandem - Fast, cross-platform, lightweight interactive Latin reader.
Christian and Faith-Related
Projects that are Christian or broadly faith-related but not specifically Catholic. Kept here for reference.
sanctum-ipsum - The holiest lorem ipsum generator on the internet. Use online, or with API. By Grayson Hicks.
random-bible-verses - Requests and displays random passages from a Bible api. By Rohan R.
christian-fortune - Classic fortune command, with a Christian twist. By Nicholas Gorden.
BibleGPT - An AI-powered Bible app for iOS and Android, curated by Mount Olive Academy (non-denominational, so not specifically Catholic).
Attic
Projects that appear no longer actively maintained (no commits in 3+ years) or whose links are no longer reachable. Preserved for historical reference.
vul - Latin Vulgate Bible on the Command Line. By Luke Smith.
Awesome Theology - A curated list of open source software for Catholic theology. By Corey Stephan.
catechism-ccc-json - The Catechism of the Catholic Church in JSON. By Gibson C.
catholicism-in-json - The Catechism of the Catholic Church, The Canon Law, and The General Instruction of The Roman Missal in usable JSON format. By Aseem Savio.
Awesome Church Calendar - List of software related to liturgical calendar computations. By Jakub Pavlík.
Catechism - The Catechism of the Catholic Church, modernised ⭐️⛪️. By Gibson C.
vulgata - The Holy Bible with both the Douay-Rheims English and Clementina Vulgata Latin texts
Biblia-Sacra-Vulgata - Biblia Sacra Vulgata is a RESTful API project primarily serving the Original Latin Vulgate ( ✝️ Biblia Sacra Vulgata) and its English Translation - Catholic Public Domain Version (CPDV) with study notes. By Aseem Savio.
graduale-romanum-1908 - 1908 Vatican Edition Graduale Romanum retypeset in Gregorio 4. By Andrew Hinkley.
Catholic Daily Readings - Daily Mass Readings, Daily Catholic Prayers and Know your Faith. By Anthony Okonta.
theocrone - A calendar for the Tridentine rite. Demo at theocrone.fr. By Philippe Aucazou.
Lectionary - A beautifully designed app to view daily readings in different languages. Can export JSON to create booklets for Nightfever Leuven. By Damiaan Dufaux.
Ember Days - Display the Ember Days for a given year. By the St. Isidore Guild.
Citation Generator - Create quotes from Saints, the Bible or any based author. By Mateus Schverz.
filipelbc/rosario - booklet to assist in praying the rosary. By Filipe L B Correia.
vul-dra - Side by side translation of the Latin Vulgate and the Douay Rheims bible. By Ray.
edsonbittencourt/tesourofieis - Space dedicated to prayer, exhibition and preservation of the holy traditions of the Catholic Church. By Edson Bittencourt.
liturgia-diaria - An API for the daily readings in Portuguese. By Danyel.
church-calendar-api - RESTful API providing Roman Catholic church calendar data for your apps. By Jakub Pavlík.
missal-1962 - Python/Flask API, serving calendar and propers for a given day, and Bootstrap UI consuming and presenting the data. By Marcin Molenda.
Liturgical Calendar - A RESTful API generating the liturgical calendar for any year from the General Roman Calendar, adaptable to nations and dioceses, with example clients. By John R. D'Orazio.
calendarium-romanum - Ruby library computing the Roman Catholic liturgical calendar (post-Vatican II); the foundation for church-calendar-api and calrom. By Jakub Pavlík.
catholic-readings-api - Free REST API providing daily Catholic Mass readings, saints, and liturgical calendar data.
tamil-bible-database - Tamil Bible Database in MySQL with PHP API. By Jayarathina Madharasan.
BibleGet - An API for retrieving Bible passages from various editions of the Bible (first and foremost Catholic editions). Various client applications are available too.
catholic-mass-readings - API for querying the daily Catholic Mass readings populated from the USCCB Bible website.
LiturgyDatabase - Swift Package Manager library providing Catholic liturgical readings in Portuguese (daily Gospels, psalms, and Mass prayers), organized by liturgical date and updated periodically. By Rodrigo Soldi.
OpenChurch - Open-data API for Catholic dioceses, parishes, and churches, aggregating data from multiple sources (notably Wikidata) with reliability indicators for app developers. By Hozana.
breviarium--core - Open-source TypeScript library providing the Liturgy of the Hours texts and logic, powering the Breviarium app.
liturgical-calendar-mcp - An MCP server that lets AI agents query the Roman Catholic Liturgical Calendar API. By CatholicOS.
liturgy-day - A REST API for Catholic liturgical queries, providing feast day names, liturgical season, color, and more, self-hosted or via liturgy.day. By Andrew Ensley.
MotivationalAPI - Help people overcome their problems with catholic and secular motivational phrases. By Miguel Gómez.
The-Collection-of-Catholic-Prayers-Api - REST API serving traditional Catholic prayers, the Stations of the Cross, and a 366-day saints feast-day calendar. By Eric Kouassi.
The-Rosary-Api - REST API serving the Catholic daily Rosary prayers, automatically selecting the correct mysteries by liturgical season or weekday tradition. By Eric Kouassi.
liturgy-components-js - Reusable ES6 UI components for building Catholic liturgical-calendar interfaces on the Liturgical Calendar API. By John R. D'Orazio.
caminho-api - A FastAPI service exposing the 999 points of St. Josemaría Escrivá's The Way (Caminho). By Élder Fausto.
lectio-api - REST API for daily Catholic Gospel readings, built with FastAPI. By Pedro Felipe.
catholic_catechism_api - FastAPI service for retrieving paragraphs from the Catechism of the Catholic Church via keyword and semantic (RAG) search, sourced from the Vatican website. By Rodrigo Rangel.
gregorio - Gregorio is a software application for engraving Gregorian Chant scores on a computer.
catebot - Reddit bot that automatically quotes the Catechism of the Catholic Church when cited in comment threads.
lilygabc - LilyPond library for typesetting Gregorian chant scores written in GABC format, enabling direct inclusion of gabc notation in LilyPond documents with support for both modern and square notation. By Jakub Pavlík.
homeassistant-catholic-calendar - Home Assistant custom component adding a Catholic liturgical calendar sensor and calendar entity.
prayer-clock - Qt6 desktop app reminding Catholics to pray the Angelus and the 3 O'clock Prayer. By Allen.
examen-a-confession-app - Windows app guiding Catholics through an examination of conscience to prepare for confession. By William Ryan McDonald.
DeFide - FOSS Catholic Android app with the Douay-Rheims and Vulgate Bible, guided Rosary, traditional prayers, and a novena tracker. By Tristin Baker.
aelf-flutter - Flutter app for the French Catholic AELF daily readings and liturgy, with offline support. By Nathanaël.
Prayer Book - mobile app with catholic prayers
Rosarium - multilingual rosary app
breviar-ios - iOS native app for the Catholic Liturgy of the Hours in Slovak, Czech, and Hungarian, companion to the Liturgia-hodin-online web project. By Akos Gyimesi.
Holy-Bible - Android app for reading the Slovak Catholic Bible translation (Slovenský katolícky preklad), with text licensed from Spolok sv. Vojtecha.
Mariam - meditative rosary app that enables believers to pray the Rosary. By Aldrin Velasco.
breviarium - Offline, lightweight app for the Roman Rite Liturgy of the Hours.
ad-aeternum - Interactive Catholic Rosary app for iOS and Android (React Native/Expo). By Bruno Pimentel.
St. Andrew Novena Mobile App - Flutter app to count daily recitations of the St. Andrew novena prayer, 15 times daily. By Mike Truso.
theochrone-mobile - Mobile companion app (Nuxt 3) to the Theochrone Tridentine liturgical calendar, available on Google Play. By Olaf-Marie Sergent.
divinum-officium - Traditional Roman Missal and Breviary Texts.
biblos - Semantic Bible search and multi-layered analysis, incorporating the Church Fathers' commentaries for historical theological perspective. Demo at biblos.app. By Jon Boldt.
Missale Meum - 1962 Roman Catholic Missal for the Traditional Latin Mass. By Marcin Molenda.
Liturgia Hodín Online - Online Breviary (Liturgy of the Hours) in Slovak, Czech, Hungarian, Latin and Icelandic, running since 2011, with companion mobile apps. By Juraj Vidéky.
Confessit - A progressive web app designed to help Roman Catholics prepare for the sacrament of confession by examining their conscience. By Mike Kasberg.
accenteur - Web tool for automatically accentuating liturgical Latin texts. By Nicolas Bancillon.
US Diocese Mapper - Create interactive and static maps of Latin Rite Catholic dioceses, provinces, and cathedrals within the United States. By Kenneth Burchfiel.
Liturgia de las Horas - Web application presenting the daily texts of the Liturgy of the Hours in Spanish, organized by year from 2015. By Manuel G. Araujo A.
Rosarium - Web application designed to help Catholics pray the Holy Rosary in Latin in an interactive and immersive way through 3D models of Catholic churches generated through photogrammetry. Demo: leozamboni.github.io/Rosarium. By Leonardo.
Domus - Web application designed to visit churches around the world through 3D models generated by photogrammetry. Demo: leozamboni.github.io/Domus. By Leonardo.
marriage-booklet - Web app to help Catholic couples plan and typeset their wedding Mass booklet. By Open Source Catholic.
Augustinus - Web app and CLI that generates GABC Gregorian chant notation from text by applying customizable musical models, with real-time SVG preview and LaTeX output. Demo at augustinus.liturgiacantada.com.br. By AISCGre Brasil.
Oficjum - A progressive web application that provides daily liturgical texts for the Liturgy of the Hours in Polish. Demo at oficjum.starokatolicy.eu. By Anna Wróbel.
catholic-bible-cheatsheet - Digital reference for the Catholic Bible Cheatsheet from Dr. Taylor Marshall with Bible verses
OrdoRomanum - Perpetual liturgical ordo for the Roman Rite, computing the Office, Mass, and feast-day particulars for any date.
TradCatholicQuotes - Traditional Catholic quote collection about the fewness of the saved, the rosary, and the use of Latin.
officium-novum - Modern liturgical engine for the traditional Roman Breviary and Missal, separating data, rubrical logic, and presentation into distinct layers and exposing a JSON API with a web frontend. By Miguel Galvez.
spiritual-bouquet-tracker - Web app to create and share Catholic spiritual bouquets with real-time tracking via a shared link. By Juan Alegría.
Rezo de los Mil Jesús - Web application to assist in the devotion of Los Mil Jesús. By Faber Andrés Vergara Holguín.
St Michael Chaplet - Chaplet of Saint Michael the Archangel
Code of Canon Law - The Code of Canon Law, with searching capability. By Shine Ministry.
auxilium-christianorum - Unofficial frontend for the daily Auxilium Christianorum prayers for the laity
London Confessions - A web app listing Roman Catholic confession times in Central London (Zone 1). By Sean Flynn.
holyrosaryonline - Web app to pray the Rosary with interactive beads and contemplative artwork. By Matt Watson.
doctors of the church - A gallery list of all 37 Doctors of the Church with descriptions and notable works. By Masaharu Mori.
PP Devocionario - web app with gregorian chants and devotional prayers in portuguese. By Augusto Moraes.
Index Librorum Prohibitorum - Web app to consult the historical Index of Forbidden Books. By Leonardo.
sacramentalrecords - Web app for digitally sharing and updating Catholic sacramental records. By Chris Treadaway.
ministryfair - Mobile-first, QR-code-driven web app for parishioners to sign up for ministries at a parish ministry fair, with a Google Sheets backend. By Chris Treadaway.
grantfinder - Tool that helps Catholic churches and schools discover available grants and find the best matches. By Chris Treadaway.
fluent-by-1000 - Interactive Chinese (Traditional) Catholic Bible reader built with Next.js; click any character for in-context AI explanations, plus frequency flashcards for the 1000 most common characters. Demo at fluent-by-1000.vercel.app. By José Álvarez.
miserend.hu - Web platform for searching and viewing Catholic Mass schedules of churches across Hungary, with administrative tools for managing the listings. By Szent József Hackathon.
ejks - Web app and open database for the Slovak Unified Catholic Hymnal (Jednotný katolícky spevník), with community-contributed hymn texts at ejks.sk. By Stanislav Bebej.
SpiriTools - An open-source, fully offline AI theological assistant for Catholics (by ADIC), grounded in Scripture, scholastic theology and magisterial texts — the digital successor to Ictus Win / Biblia Clerus.
CCC-ai-guide - A locally-run (Ollama) AI assistant that answers questions on the Catholic faith using only the Catechism of the Catholic Church. By Steve Seelan.
romcal - The Liturgical Calendar used by the Roman Rite (Western Church) for Node JS v6 and above.
tridentine_calendar - Python library and CLI for calculating the 1962 Roman Catholic (Tridentine) liturgical calendar. By Joseph Antognini.
gabctk - Command-line toolkit for Gregorian chant GABC files, converting them to MIDI, LilyPond, ABC, and MusicXML formats, with transposition and text-extraction features. By Jacques PERON.
catholic-cli - Command-line tool for easy access to Catholic resources including the Catechism, Canon Law, and the Bible. By Aseem Savio.
roman calendar - Roman Catholic Liturgical Calendar Generator. By Jayarathina Madharasan.
python-curses - Terminal-based Rosary guide written in Python using the curses library.
agape-deus - Daily Catholic Readings in your terminal. By Nicholas Gorden.
ordotools - Python generator for the pre-Vatican II Roman Catholic Ordo. By Fr. Barnes.
Lectio.nvim - Neovim plugin to practice lectio divina. By Nicholas Gorden.
focus-study - A collection of FOCUS Bible studies in booklet format. By Ryan Vanden Bos.
sacra-scriptura - Read the bible in your terminal. By Nicholas Gorden.
St. Pius X Catechism - Catechism of St. Pius X frontend. By Matthew Wong.
cardinals - The list of all Roman Catholic Cardinals in json format. By Chris.
Baltimore Catechism #2 - Baltimore Catechism No. 2 in JSON. By Matthew Wong.
opus - Pray the traditional 1962 Roman Breviary (Divine Office) in the terminal.
AquinasOperaOmnia - The full works of St. Thomas Aquinas
bibliaAveMariaJSON - The Catholic Bíblia Ave Maria (a popular Brazilian Portuguese translation) in JSON format.
nocturnale-romanum - Digital typesetting of the Nocturnale Romanum, the Roman Rite chant book for Matins, containing over 1,400 pieces in GABC and TeX, produced by a volunteer steering committee.
summa.json - The Summa Theologica of St. Thomas Aquinas parsed into JSON for easy programmatic access. By Jacob Gray.
vulgate - The Latin Vulgate with full ecclesiastical accent marks, plus a yearly reading plan. By Nicolas Bancillon.
romanus - The entire Roman Catechism of the Council of Trent
In-adiutorium - Complete musical setting of the Czech translation of the Roman Catholic Liturgy of the Hours, encoded in LilyPond. By Jakub Pavlík.
bible-nabre-json-dataset - The New American Bible Revised Edition (NABRE) in JSON, with the script used to generate it. By Nirmal Benann.
Editio-Sti-Wolfgangi - Liturgical booklets for the Roman Catholic Divine Office with Gregorian chant notation, compiled with LuaTeX and Gregorio. By Jakub Pavlík.
Vesperale-Romanum - The Vesperale Romanum — chant book for Roman Rite Vespers and Compline of the Divine Office — retypeset using Gregorio.
atelier - Chant books and liturgical texts in the Dominican tradition, encoded in TeX and Gregorio, produced by the Atelier St. Jacques. By Fr. Innocent Smith, O.P.
roman-catholic-popes - Comprehensive CC0 dataset of Roman Catholic popes and antipopes in JSON, CSV, and plain text formats. By Brandon Himpfen.
loth-music-bibliography - International bibliography of sheet music for the Roman Catholic Liturgy of the Hours, published at inadiutorium.cz/bibliography. By Jakub Pavlík.
codexcommunion/prayer-collection - A comprehensive collection of traditional Roman Catholic prayers in multiple languages, organized as structured JSON files.
Documentos Catolicos - a collection of various Catholic resources, using PowerShell scripts to generate the archive. By José Cláudio Aguiar.
biblia-wujka - Tools converting the Jakub Wujek Bible (a classic Polish Catholic translation) into OSIS and SWORD formats. By Bartosz Gleń.
CantusCorpus - A versioned dataset of catalogued Gregorian chant records from the Cantus databases. By the DACT project.
Catholic Lectionary on ESP8266 - The Roman Catholic Lectionary, Liturgical Calendar and Feast Days on ESP8266 with Waveshare 2.7" or 4.2" red/black display, generic SD card reader and DS3231 clock IC. By Philip Lishman.
GarminRosary - Standalone, fully offline Rosary companion app for Garmin smartwatches.
Word of the Lord - Pebble smartwatch face showing the time, weather, and the daily Gospel (or quotes from theologians of your choice), with optional Gemini AI summaries.
Awesome Catholic (servusdei2018) - Another well-maintained curated list of open-source Catholic projects. By Nate.
Whitaker's Words - William Whitaker's WORDS, a command-line Latin dictionary, invaluable for ecclesiastical Latin. By Martin Keegan.
tandem - Fast, cross-platform, lightweight interactive Latin reader.
sanctum-ipsum - The holiest lorem ipsum generator on the internet. Use online, or with API. By Grayson Hicks.
random-bible-verses - Requests and displays random passages from a Bible api. By Rohan R.
christian-fortune - Classic
vul - Latin Vulgate Bible on the Command Line. By Luke Smith.
Awesome Theology - A curated list of open source software for Catholic theology. By Corey Stephan.
catechism-ccc-json - The Catechism of the Catholic Church in JSON. By Gibson C.
catholicism-in-json - The Catechism of the Catholic Church, The Canon Law, and The General Instruction of The Roman Missal in usable JSON format. By Aseem Savio.
Awesome Church Calendar - List of software related to liturgical calendar computations. By Jakub Pavlík.
Catechism - The Catechism of the Catholic Church, modernised ⭐️⛪️. By Gibson C.
vulgata - The Holy Bible with both the Douay-Rheims English and Clementina Vulgata Latin texts
Biblia-Sacra-Vulgata - Biblia Sacra Vulgata is a RESTful API project primarily serving the Original Latin Vulgate ( ✝️ Biblia Sacra Vulgata) and its English Translation - Catholic Public Domain Version (CPDV) with study notes. By Aseem Savio.
Catholic Diocese App - Android - A Catholic diocese app for android. By Jeff Geerling.
lectionarium - A tool for studying Ecclesiastical Latin. By David R M Charles.
Catholic Diocese App - iOS - A Catholic diocese app for iOS. By Jeff Geerling.
Awesome Bible - A curated list of awesome resources and websites about the Bible and topics related to it.
geomesse-api - Get mass time in your country. By CarpeDeum.
missal.io - A Catholic Sunday hand missal web app for the Traditional Latin Mass. By Ben Yanke.
calrom - Liturgical calendar (Ordinary Form). By Jakub Pavlík.
pytholic - Catholic-themed python package
graduale-romanum-1908 - 1908 Vatican Edition Graduale Romanum retypeset in Gregorio 4. By Andrew Hinkley.
Catholic Daily Readings - Daily Mass Readings, Daily Catholic Prayers and Know your Faith. By Anthony Okonta.
theocrone - A calendar for the Tridentine rite. Demo at theocrone.fr. By Philippe Aucazou.
Lectionary - A beautifully designed app to view daily readings in different languages. Can export JSON to create booklets for Nightfever Leuven. By Damiaan Dufaux.
Pray the Rosary - A progressive web app designed to help Roman Catholics pray the Rosary. Demo at prayrosary.netlify.app. By Artur.
Ember Days - Display the Ember Days for a given year. By the St. Isidore Guild.
Citation Generator - Create quotes from Saints, the Bible or any based author. By Mateus Schverz.
filipelbc/rosario - booklet to assist in praying the rosary. By Filipe L B Correia.
vul-dra - Side by side translation of the Latin Vulgate and the Douay Rheims bible. By Ray.
edsonbittencourt/tesourofieis - Space dedicated to prayer, exhibition and preservation of the holy traditions of the Catholic Church. By Edson Bittencourt.
