FOSS apps: free and open source

Free and open-source software: the source code is public under an open licence.

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Drowser

Simple background app killer
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Drum On!

Use your smartphone as a virtual drum
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
DSA Assistent

Ein Helfer für das Schwarze Auge
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DSC Auto Rename

Rename pictures based on date
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
DSU Sideloader

Easily install GSIs using Android's DSU feature
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DSub

Play music across the network
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DSub2000

Android client for Subsonic servers.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
DuckDuckGo

Privacy, simplified
- Internet
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- iOS
- Android
- Windows
- macOS
App Store Google Play Aurora Store F-Droid GitHub Zapstore
DuckRun

A game about a duck
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Duetto

A tiny Discord for two, on your own server: a permanent voice and video channel.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
DumDum

Simple VPN over SOCKS/HTTP/HTTPS proxy
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
DumpSeeker

DumpSeeker shows sanitary dump stations for camper vans listed in OpenStreetMap
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Dumpsys Packages Copycat

Provides a detailed summary of all installed packages
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Dungeon Crawl Stone Soup

A roguelike adventure through dungeons in a quest to find the Orb of Zot
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Dungeon Crawl: Stone Soup for Android

An ASCII port of Dungeon Crawl: Stone Soup.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Duorem

Wake up or shutdown remote computer from your phone/tablet.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
D
Duper

Lost your phone? Send it "duper".
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Duress

Duress password trigger
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
DuressKeyboard

Keyboard that reacts to triggers and performs security actions
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
DuressKeyboardLite

Keyboard with DuressPassword feature.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
DuressUltimate

Robust implementation of the Duress Password trigger
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Dutch for AnySoftKeyboard

AnySoftKeyboard Dutch Language pack
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
DuWave

Dynamic local and online music player
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Dynamic Night Light

Low brightness clock
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Déjà Vu - A local RF based back end for the µg Pro

Mobile/cell and WLAN/Wi-Fi based network provider for UnifiedNlp and microG
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DékaDico

Spoken numbers memory trainer
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
e-Passport Reader

use the NFC chip to communicate with an electronic passport
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
E6B Flight Computer

This is a simulation of the E6B flight computer.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Earth View for Muzei

Google Earth View plugin for Muzei
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
E
Easer (beta)

User-defined explicit automation for Android
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Easter Eggs

Collections the Android release Easter Egg.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
E
Easy Dice

RPG dice roller
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Easy Ear Trainer for Chord Progressions

Simple ear training for musicians to recognize different chords.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Easy Launcher - Minimal launcher

EasyLauncher - Minimal and Clutter Free Android launcher
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Easy Noise

A simple Android app to play white noise.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Easy Open Link

Open links without cumbersome copy & paste!
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Easy Repost and Downloader for Instagram

Repost and download Instagram posts by clicking "Copy Share URL" in Instagram.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Easy Watermark

Securely, easily add a watermark to your sensitive photos.
- Multimedia
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid IzzyOnDroid GitHub Zapstore
Easy Xkcd

Easy xkcd is an Open Source reader for xkcd
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Easy-phone

Accessibility helper for the elderly or visually impaired.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
EasyRPG Player

RPG Maker 2000/2003 and EasyRPG games interpreter
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
EasySSHFS

Sshfs with ssh client and interface for Android.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
EasySync

Synchronize your phone with your WebDAV server, the easy way.
- Productivity
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid Zapstore
Eat Poop You Cat

Eat Poop You Cat is a bit like telephone with writing and drawing.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
EbookConverter

Android ebook converter — epub, mobi, azw3, docx and more. No Calibre needed.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
EBT New Note

Submit Euro bill note data to EuroBillTracker.com
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Echo

Time travelling audio recorder for Android.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Edge Roll

Tumble a cube across a crumbling tile bridge. One-thumb 3D arcade.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore