Assuming that everything on F-Droid is open source: F-Droid, Syncthing Fork, Termux, Linux Command Library, Jerboa, DuckDuckGo, KDE Connect, Librera Reader, Material, NewPipe, NewsBlur, Pedometer, PeerTube, Simon Tatham’s Puzzle Collection, Tusky, VLC and Warpinator.
Assuming that everything on F-Droid is open source: F-Droid, Syncthing Fork, Termux, Linux Command Library, Jerboa, DuckDuckGo, KDE Connect, Librera Reader, Material, NewPipe, NewsBlur, Pedometer, PeerTube, Simon Tatham’s Puzzle Collection, Tusky, VLC and Warpinator.