Kwik EFIS

Aviation Glass Cockpit / Electronic Flight Information System with ADS-B "Radar"Apache-2.0

FairEmail

Fully featured email client. Neat, intuitive user interface. Privacy friendlyGPL-3.0-only

Finder

Remote mobile phone searching via SMS requests.GPL-3.0-only

Carnet

Powerful note taking app with sync and online editorGPL-3.0-only

Raccoon

Unlimited social: write as much as you want and enrich posts with formattingGPL-3.0-only

Fossify Voice Recorder Beta

Record anything with this Open-source and Ad-free recorderGPL-3.0-only

Trail Sense

Use your phone's sensors to assist with wilderness treksMIT

Transportr - Public Transit

Free Public Transport Assistant without Ads or TrackingGPL-3.0-or-later

Trekarta - offline outdoor map

Detailed offline topo maps for hiking, cycling, skiing and other activitiesGPL-3.0-or-later

Lavabit Encrypted Proxy

Client for Lavabit‘s Encrypted ProxyGPL-3.0-only

Multi Launcher ‧ Home Screen

Multi Launcher ‧ Home Screen, Minimal UI LauncherGPL-3.0-only

NOVA Video Player

Video player for local/network content with subtitle/metadata download supportApache-2.0

FeedFlow - RSS Reader

Minimal, fast, unclutteredApache-2.0

Fossify Music Player

Open-source and Ad-free Music Player with customizable widget & sleep timerGPL-3.0-only

Ceno Browser: Share the Web

Access any website, then share it peer-to-peer.MPL-2.0

Auxio

A simple, rational music playerGPL-3.0-only

Gramophone

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

F-Droid

The app store that respects freedom and privacyGPL-3.0-or-later