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.
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.
SDR++ https://github.com/AlexandreRouma/SDRPlusPlus
Though you'll need additional hardware.
The best general-use SDR program available on Android. The other apps are just very limited mobile apps, but this gives a full desktop experience. It does support less devices than on desktop, but that's fine. You can run it as server on desktop, and connect to the SDR++ server on your phone.
Here's a screenshot:
In the screenshot, it's connected to SDR++ server running on my laptop, to which I have connected RSP1. I couldn't use the RSP1 with SDR++ on Android directly, as it requires proprietary API. But I could for example use RTL-SDR, the most popular SDR. Or maybe Airspy, Airspy HF+, HackRF or Hermes. It can also connect (network) to PlutoSDR, RFspace, RTL-TCP, SDR++ and SpyServer.
But there's more awesome SDR programs available for Android:
SatDump for satellite data processing
SDRAngel which tries to do as much as possible in single program (there's no scaling settings, so prepare a stylus or mouse)
Welle.io for receiving DAB/DAB+ radio
RTL-SDR driver allows you to run RTL-TCP server on the phone. It's also used as a driver by many other apps.
Haha, an old friend of mine created SDR'++
I've been using Seeker to get hi def flacs for my music library since I decided Spotify sucks a little while back!
Since I've flipped to offline music, it's been a dream to return to the forever glorious Poweramp music player. Gorgeous & compatible with a buncha skins from the play store, but best of all, you can setup profile based EQs that'll trigger based on song, album, Bluetooth device, genre... It's wild
For podcasts I use Feeder on my RSS feeds & AudioAnchor as my player. Straightforward & operable from my pocket, which is all I need!
Keepass2android is a great password manager that does biometric auth & slick password generation. File based tho, be sure to sync it somewhere.
Underhand
Free game, no ads, no internet, no info access, no update.
Small minus, you have to download it from play store.
As a French guy, this is a gem https://play.google.com/store/apps/details?id=com.leconjugueur.droid&hl=fr_CA&gl=US
If you're a little bit nerd, this is interesting https://play.google.com/store/apps/details?id=com.merckgroup.pte
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