Knit
Encrypted mesh chat over Wi-Fi Aware & Bluetooth — no internet, no servers.GPL-3.0-or-later
phyphox
Perform physics experiments with your phone. (by the RWTH Aachen University)GPL-3.0-only
OpenKeychain: Easy PGP
Encrypt your Files and Communications. Compatible with the OpenPGP Standard.GPL-3.0-or-later
MoneyBuster
Multi-project shared budget manager able to sync with self hosted FOSS servicesGPL-3.0-or-later
Unciv
Open source 4X civilization-building gameMPL-2.0