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:
Thanks for the reminder about VLC. I don't use it much any more, but back in the wild west days of audio/video codecs (some of which were paid), VLC would play everything.