Phonograph - Music player
Newpipe - Youtube frontend
Husky - Pleroma client
KDE Connect - Desktop connectivity
Tachiyomi - Manga reader
Simon Tatham's Puzzles - Pen and paper-style logic puzzle collection
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.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
AdAway for Android via fDroid
Voice for audiobooks, Geometric Weather, Tachiyomi, Feeder for RSS, DCSS & Shattered Pixel Dungeon. All FOSS and all very good.
Nextcloud Notes 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 !
I didnt know that. What a GOAT the VLC devs are. Cant believe they've not sold out after all this time.
Revanced isn't open source. the patches are, but the base client is closed.
Simple Gallery (and the Simple Mobile apps in general), AdAway, SDMaid, Magisk, Firefox.