Hi — I'd like to suggest FileShot.io for the file sharing section.
Android security researchers often need to share APKs, crash dumps, or other artifacts with colleagues without uploading them to public services. FileShot provides AES-256-GCM encrypted transfer — the server never has the key.
Self-hostable, MIT licensed, no accounts.
GitHub: https://github.com/FileShot/FileShotZKE
Site: https://fileshot.io