Newpipe is nice (open source youtube app with lots of extra features), also as far as I know Firefox on Android is the only major smartphone browser that has add-on support

There are a lot of good apps in F-Droid.

Check this guide for the best FOSS apps on Android

Relay is goated if youre still terminally addicted to reddit (like me.)

Like other commenters have said firefox on android is the only good android browser (and coincidentally, the only android browser which gets official dev support! Use firefox libs.)

Youtube vanced or newpipe

AntennaPod is a decent podcast app - and open source.

deleted by creator

Android apps for what purposes? There’s plenty of good stuff out there but I don’t know if NFC Tools and ConnectBot are relevant in your day-to-day life.