Mobilism - https://forum.mobilism.org/viewforum.php?f=398
Mods.

4PDA - https://4pda.to/forum/index.php?showforum=212

F-Droid - https://f-droid.org/

APKMirror - https://www.apkmirror.com/

Apps

• foobar2000 - https://www.foobar2000.org/android
  Music player.

• eBoox - Google Play
  Reader for EPUBs.

• Pocketbook - Google Play
  Reader for PDFs and DJVUs.

• Home Dictionary - https://github.com/mortalis13/HomeDictionary/releases
  Great app for .dsl dictionaries.

• Feeder - Google Play
  Open source RSS reader.
  Feeds: essentials.opml

• Smart AudioBook Player - Mobilism
  Good audiobook player.

• AntenaPod - Google Play
  Open source podcast app.

• LibreTorrent - https://github.com/proninyaroslav/libretorrent/releases
  Open source Bittorent client.

• Firefox - Google Play
  Don’t use Google Chrome. Google went full totalitarianism removing uBlock. Firefox Android app can install same extensions as desktop browser. Firefox is the GOAT.