Piano

Virtual piano keyboardGPL-3.0-only

Semitone

tuner, metronome, and pianoGPL-3.0-or-later

Tonality

Piano keyboard with scale highlightingGPL-3.0-or-later

MidiSheetMusic

Graphical midi file playerGPL-2.0-only

PianOli

Baby game to keep your device safe from random baby-tapsGPL-3.0-only

Habits

Habits is an app for tracking and helping to maintain good habits.GPL-3.0-or-later

Feeel - home workouts

A simple home workout/exercise app that respects your privacyAGPL-3.0-or-later

Trail Sense

Use your phone's sensors to assist with wilderness treksMIT

MoneyBuster

Multi-project shared budget manager able to sync with self hosted FOSS servicesGPL-3.0-or-later

OSM Dashboard for OpenTracks

OpenStreetMap dashboard for OpenTracksApache-2.0

WikiReader

Read Wikipedia pages distraction-freeGPL-3.0-only

Conversations

Encrypted, easy-to-use XMPP instant messenger for your mobile deviceGPL-3.0-only

wger Workout Manager

Fitness/workout, nutrition and weight trackerAGPL-3.0-or-later

Noice: Natural calming noise

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

Wikipedia

The official app for Wikipedia, the world’s largest source of information.Apache-2.0