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.
No Stupid Questions
No such thing. Ask away!
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Falling Lightblocks, available on his own website or GitHub.
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:
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SatDump for satellite data processing
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SDRAngel which tries to do as much as possible in single program (there's no scaling settings, so prepare a stylus or mouse)
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Welle.io for receiving DAB/DAB+ radio
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RTL-SDR driver allows you to run RTL-TCP server on the phone. It's also used as a driver by many other apps.
Underhand
Free game, no ads, no internet, no info access, no update.
Small minus, you have to download it from play store.
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.
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.