FOSS apps: free and open source

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

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Quad9 Connect

Android application for Quad9 recursive DNS cybersecurity and privacy services
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Quadermas

View school marks, topics, timetable
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
QuandoInTV

Don't miss the broadcast of your favorite TV programs
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Quasseldroid

Chat comfortably. Everywhere. REQUIRES A QUASSEL CORE
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Quedalle

Quedalle in ads, tracking, accounts. Just a tile launcher.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Queens

Challenging crown-placement logic puzzle. Infinite levels. No tracking & ads.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Quest Log

Balance life's Main and Side Quests in a private, offline game-themed to-do app
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Quicall

Secure messaging with chat, voice and video calls.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Quick Ball

A Quick Action Ball that gives fast access to controls —volume, brightness, lock
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Quick Calculation

Improve your Maths Calculation Speed
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Quick Draw Everywhere

Draw and take notes everywhere on your device
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Quick Search

Search apps, contacts, files, settings, calendar, and the web from one bar
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Quick Settings Sound Profile

Change your sound profile (ring, vibrate, mute) via a Quick Settings tile.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
QuickDic

Offline translation dictionary
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
QuickSE

QuickSE lets rooted Android users view and change SELinux mode easily.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
QuickShot: Share Screenshot

Replace the assistant gesture with quick screenshot share. Quickest way to share
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
QuickTile Settings

Manage Private DNS & USB Debugging via Quick Tile Settings tiles & Auto-revert.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
QuickTiles

Android Quick Settings Tiles
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
QuickWeather

Weather at a glance for anywhere in the world!
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Quiet Grid: Logic Puzzles

Sudoku, Nonogram, Minesweeper, Word Search & more. No ads, fully offline.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Quiet Rebellion

Control your Bose QC Ultra 2 directly — no Bose app, no cloud, no account.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
QUIK SMS

Open source replacement to the stock SMS app on Android. A revival of QKSMS.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Quinb: 4 players reaction game

A multiplayer reaction game: train your mind and your reflexes while having fun!
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Quire

Self-hosted EPUB reader for calibre-web. No telemetry, no cloud, your data.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Quits

Quits is a privacy-preserving expense splitting application
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Quitter: Habit Tracker

Track quitting progress, milestones, journals, and recovery reminders.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
QuorumPony

Split a secret into printable cards. Any K of N recover it. Fully offline.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Quote Unquote

A Quotations / Affirmations App Widget
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Quoter

Display quotes
- Education
- FOSS
- Free
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Quotes - Quotes Status Creator

Quotes Status Creator lets you share quotations as images on social media
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Quotes.app

A minimalistic quotes app
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Quran Revision Companion

Quran for huffaz with mutashabihat(similar ayats) and mistake marking
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Qz
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
RaagaDB

RaagaDB app is meant to be comprehensive database for Carnatic Raagas
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Raccoon

Unlimited social: write as much as you want and enrich posts with formatting
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Raccoon for Lemmy

Mobile client for Lemmy, a federated aggregation and discussion platform.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
RacketGhost

Ghosting Coach for Squash, Badminton and Racketlon
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Radar App

Alternative and radical events nearby
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Radio Romania

Play the latest podcasts from Radio România.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
R
RadioDroid

Browse and stream internet radios
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
RadioWave

RadioWave gives you access to 50,000+ internet radio stations worldwide.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
RailTrip

Travel through the train stations to stamp your visa!
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Railway station photos

Collect photos of railway stations for https://railway-stations.org
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid Zapstore
Raise To Answer

Simply hold your phone to your ear to answer an incoming call
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
RakuRaku IME

Traditional Chinese keyboard for the EZ Input Method, with English predictions.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Ramblr

Tap, ramble, tap. Clean dictated text lands wherever your cursor is.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
RandomFileMaker

Make random files with SecureRandom. For KeePass keyfile, shredding disk, etc
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Randomix - Decision Maker

An app to randomly choose between numbers, answers, options. 🃏
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore