A collection of UI Frameworks and their platform implementations. Inspired by this HN thread.
If you would like to add libraries, please feel free to create a PR with the edits. Please only open source, no paid libraries. Also please try to keep the markdown consistent.
Table of Contents
Project Website: https://material.io/
Project Website: https://getbootstrap.com/
Project Website: https://developer.microsoft.com/en-us/fabric
Project Website: https://www.lightningdesignsystem.com/
Project Website: https://elastic.github.io/eui/#/
Project Website: https://foundation.zurb.com/
Project Website: https://semantic-ui.com/