Paul Buetow's own Android apps, published straight from their GitHub releases. Each APK keeps its developer signature.

Currently it serves 9 apps. To add it to your F-Droid app, scan the QR code (click it to enlarge) or use this link:

https://snonux.github.io/fdroid/repo

If you would like to manually verify the fingerprint (SHA-256) of the repository signing key, here it is:
04 B0 5F B0 56 55 43 E0 58 37 2B 86 7B 3D 3A 69 9D 9D 66 83 88 CE 67 04 78 ED D4 11 6D 73 6D F7