Here's a list of what I'm currently using / following, hoping some would share theirs so we can all check out any other cool foss apps:

Name: ADB AppControl [NOT FOSS, but free & super useful for personal use]
Info: https://adbappcontrol.com/en/
Tested on: Windows (for any Android-based platform including Android TV)
Comments: When you don't want to root your phone / tablet / tv but you want to get rid off bloatware or even system stuff, this is it. Make sure you know what you're getting rid of / make a backup.

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Android:

Name: NewPipe
Info: https://github.com/TeamNewPipe/NewPipe
Tested on: Android
Comments: Youtube client, no ads, download options, no need for GSF or such

Name: InnerTune
Info: https://github.com/z-huang/InnerTune
Tested on: Android
Comments: YT Music with all the features you'd want. Android Auto support as well.

Name: Infinity For Reddit
Info: https://github.com/Docile-Alligator/Infinity-For-Reddit
Tested on: Android
Comments: A reddit client with "piped-like" features

Name: Fritter
Info: https://github.com/jonjomckay/fritter
Tested on: Android
Comments: A twitter client with "piped-like" features

Name: Aurora Store
Info: https://gitlab.com/AuroraOSS/AuroraStore/
Tested on: Android
Comments: A Play-Store client, no GSF required, no logins required to install any apps, device-spoof features

Name: Neo Store
Info: https://github.com/NeoApplications/Neo-Store
Tested on: Android
Comments: An F-Droid client that actually looks better than the official F-Droid store, Material Design

Name: Aegis
Info: https://github.com/beemdevelopment/Aegis
Tested on: Android
Comments: 2FA app with lots of ways to add entries & multiple backup/restore options

Name: Five Prayers
Info: https://github.com/Five-Prayers/five-prayers-android
Tested on: Android
Comments: a proper no ads/no tracking/open-source Muslim app


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Android TV:

Name: SmartTubeNext
Info: https://github.com/yuliskov/SmartTubeNext
Tested on: Android TV
Comments: a piped-llike Youtube client developed specifically for Android TV - you have options to login for more features, or just don't login if you don't need it

Name: Clock-On-Top
Info: https://forum.xda-developers.com/t/floating...oid-tv.4144463/
Tested on: Android TV
Comments: A floating clock for your Android TV

Name: LeanbackOnFire
Info: https://github.com/leanback-on-fire/LeanbackLauncher
Tested on: Android TV
Comments: You hate that latest Google TV update/interface? You like the old leanback launcher but wish it has more customize options? Try this

Name: Button Mapper [NOT FOSS, but free & super useful for personal use/there's a paid PRO version]
Info: https://buttonmapper.app/
Tested on: Android TV
Comments: re-map your buttons on your remote.

Name: Coffee
Info: https://github.com/mueller-ma/Coffee
Tested on: Android
Comments: Keep your display on with just a toggle