Firefox, ppsspp, termux, VLC, Tachiyomi(SY), and KeypassXC/DX are coming to my mind. Probably there are a lot more. These are for android. Although they do apply to desktop except termux and Tachiyomi.
Edit: I haven’t added the various FOSS tools as they don’t really come in “App” Category. Some of them:
Firefox, ppsspp, termux, VLC, Tachiyomi(SY), and KeypassXC/DX are coming to my mind. Probably there are a lot more. These are for android. Although they do apply to desktop except termux and Tachiyomi.
Edit: I haven’t added the various FOSS tools as they don’t really come in “App” Category. Some of them:
+1 for Firefox and VLC. Always amazes me that such good programs are available for free. Remember to donate to FOSS projects, people!