Financial calculators has a bunch of useful calculators for figuring out loans, mortgage payments, compound interest, bonds, and tons more.
Some foss music apps i like:
Seeker - for downloads
Metro - for playing downloaded music
Vimusic, blackhole, innertune or spotube - for streaming
I've mostly been using Spotube, its awesome!
I don't know how hidden it is because most people into making electronic music at all know about it, but Koala sampler is a fantastic value at $5 for an intuitive and fun way to make some silly loops.
"Birdnet" for recognizing the little birds' voices.
https://play.google.com/store/apps/details?id=de.tu_chemnitz.mi.kahst.birdnet
Tidy panel 3 for hiding un-dismissable notifications from notification panel (for my Samsung phone). Icon pack studio for generating custom icon packs.
Arity, the perfect calculator. I know that it is just a calculator app but it lightweight, open-source, has 2D and 3D graphing (!) and of course can do calculations.
I gotta shout out cloudstream, a streaming alternate. Foss, great app available on f droid.
While i'm on that i'll add showly there too.
Sadly it's not on the playstore anymore, but I've had a free Tetris clone app on my phone for years that has served as a good time killer or a distraction from awkward silence. It's called Tetra Classic. I think you can still find the APK somewhere, hopefully in reputable sources.
Underhand
Free game, no ads, no internet, no info access, no update.
Small minus, you have to download it from play store.
Small caveat, not available on latest version of Android
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