This is the repository of Metatrans Apps, which is compatible with the F-Droid clients widely used by the F-Droid Community. While not all apps in this repository are open source yet, they are free for use.
Currently it serves 9 apps. To add it to your F-Droid client, scan the QR code (click it to enlarge) or use this URL:
If you would like to manually verify the fingerprint (SHA-256) of the repository signing key, here it is: