FOSS apps: free and open source

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

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Dealing Sheet

An app to make dealing hands of cards for games like bridge easy.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Debate Timer

A minimalist timer, so you can focus on speaking.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Debitum

keep track of lent money and items
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DebtCalc

Calculating the debt at your finger tips.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Debug Mode Widget

Home screen widget showing USB and wireless ADB debug status at a glance.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
DeBurrow

A modern Gopher protocol client for Android.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Decisions

Helps in decision making by weighing arguments
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Decred Address Scanner

Scans Decred addresses for available funds and notifies of changes.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DecSync CC

Sync contacts, calendars and tasks without a server using DecSync
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
D
deedum

A browser for the gemini protocol
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Deep Links for LabCoat

Open links to self-hosted GitLab instances in LabCoat
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Deep Rock Galactic Assistant

Assistant for Deep Rock Galactic - game about dwarves in space. Rock and Stone!
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DeepL

Unofficial Android App for DeepL Translator
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Deepr

Simplify link handling. Save, organize, and open links with ease.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
DeepWave: Binaural Beats

Binaural beats & isochronic tones for sleep, focus and relaxation
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Defang

Launcher that puts speed bumps between you and the apps engineered against you
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
DEfO ECH Apps

Experimental fork of F-Droid to use TLS ECH with Cloudflare as the default host
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Deine Rechte

Deine Rechte im Kanton Bern
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Deku SMS

Deku is an SMS app that supports end to end encryption and photo sharing
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Delist

Focus on the task at hand
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Deliveries: Track your parcels

Track all your parcels with ease.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Delta Chat

Decentralized private messenger with chat-shared tools and games.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Delta Icon Pack

Minimalistic pastel icon pack for Android
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
DeltaCamera

Record movement (deltas) in one single image
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
D
DeltaSync

Encrypted KeePass sync — requires your own self-hosted server.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Demo Musix

Listen to short demo version of any song you want.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DEMOCRACY

Dein virtuelles Bundestagsmandat
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
D
Democracy Droid

Watch "Democracy Now The war and peace report"
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Demodulate

Simple internet radio app
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Denaro

Private, offline personal finance with accounts, categories and insights.
- Finance
- FOSS
- Free
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Der Die Das

Android app for learning German nouns genders.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Derandom

Pseudo random number predictor
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Deskflow Android

A fully functional (90%) Deskflow client application for Android devices
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Desktop Mascot

A customizable animated mascot for your Android screen
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Destination Sol

2D space arcade/RPG with seamless open world & planets
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
Destiny

Send files with end-to-end encryption without revealing your identity
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
DetermApp

use determination keys easily
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
DetoxDroid: Digital Detox by Default

Grayscale, doomscrolling breaker, app blocker: a boring phone by default
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
deutsia radio

Privacy-focused radio player supporting clearnet, Tor, and I2P networks
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Device Connect

Yet another tool to connect Android phone with desktop
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Device Watch

System monitor widget with per-app usage insights and a charging screensaver
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Devinettes

A collection of riddles in verse
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
DevQS

Quick Settings tiles for developers
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
DevSwitch

Toggle developer options, USB and wireless debugging, with Quick Settings tiles
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Dhaaga (Lite)

SNS client for Mastodon, Misskey and Bluesky | by suvam.io
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Dharmik Online

Browse Bhagavad Gita
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Dhizuku

A tool that can share Device Owner permissions to other applications.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Dhwani - Volume Control

Restore system volume controls on devices with broken volume buttons.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore