Snapcast - multi-room audio in perfect sync

Synchronize audio output across devices/playersGPL-3.0-or-later

PipePipe

A FLOSS Android app to let you browse YouTube, NicoNico and BiliBili freely.GPL-3.0-or-later

M.A.L.P.

M.A.L.P. - MPD ClientGPL-3.0-or-later

PlayMusic Widget (sample)

Play music from a widgetMIT

Music

The stock audio playerApache-2.0

Droidgain

Normalizer for audio filesGPL-3.0-only

Fast N Fitness

Track fitness workoutsBSD-3-Clause

Gramophone

Simple offline music player with minimalistic designGPL-3.0-or-later

RadioDroid

Browse and stream internet radiosGPL-3.0-only

MPD

A flexible, powerful, server-side application for playing musicGPL-2.0-or-later

Odeon

Play and manage locally stored music filesApache-2.0

Auxio

A simple, rational music playerGPL-3.0-only

SimpMusic

A simple music app using YouTube Music for backendGPL-3.0-only

Monkeyboard Keystone Radio

Monkeyboard FM & DAB/DAB+ radio interfaceGPL-3.0-only

Amaze File Utilities

Analyse, transfer and open files all in one app.GPL-3.0-or-later

Automation

Automate stuff on your device by creating rules.GPL-3.0-or-later

Noice: Natural calming noise

Focus, meditate and relax with natural calming noise.GPL-3.0-only