iSoron / uhabits

Loop Habit Tracker, a mobile app for creating and maintaining long-term positive habits

PubDeer / astro-loop

Open-source roguelike shooter for Android. Simple controls, no ads, no tracking, no internet permission. Free forever under GPLv3.

nightscout / AndroidAPS

Opensource automated insulin delivery system (closed loop)

riveerxd / nightbell

Android uptime monitoring with no server and no account. Checks run on your phone; an outage arrives as a full-screen page with a looping alarm instead of a notification you swipe away.