AdAway for Android via fDroid
Free and Open Source Software
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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My most used is probably Lawnchair, but I don't really use it as much as see its work. Also Notally for notes.
Revanced for YouTube, Audacity, KDENlive, VLC, OBS studio, and the *ARR suite of applications.
Edit: I did not see that you said Android. Revanced it is then.
vlc has an android app too! try it out !
Revanced isn't open source. the patches are, but the base client is closed.
Android
- Waistline calorie counter
- Verifit workout diary
They're both pretty basic but honestly upon switching I realized how many superfluous features I didn't use in my old apps.
Nextcloud Notes for notes
Simple Gallery (and the Simple Mobile apps in general), AdAway, SDMaid, Magisk, Firefox.