FOSS apps: free and open source

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

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PrivacyBreacher

showcase privacy issues in Android
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
PrivacyScanner

scan installed apps and highlight privacy risks by analyzing their permission
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Privamatic

Your phone's privacy, scored 0–100. 50 checks, no internet permission.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Private DNS Quick Tile

Quickly toggle and configure Private DNS on Android 9.0+
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Private Internet Access VPN

Fast, secure and open source VPN client for Android.
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Private Lock

Lock your phone from its movement force
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Pro Expense - Daily Finance Tracker

A simple free finance note to safely record daily expense without any Ads.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
ProcrastiLearn

Block distracting apps until you review a spaced-repetition flashcard
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Prog Metronome

Metronome for practicing complex rhythmic ideas.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Progress Tracker

Any activity progress tracker
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
ProgressBars

A simple timer / countdown app
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
Project Asteria

A FOSS Android app for space exploration using official NASA APIs
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
ProjectLaogai

an app for the Hochschule Offenburg
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
ProseReader

ProseReader for Android - Ebook/EPUB Viewer
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
ProtectedWorkProfile

Profile owner Android security app.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Protocol Berg Schedule

Program app for the Protocol Berg conference
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
ProximitySensorFix

simple fix for during call proximity sensor issues
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
Proxy Exit

Use your phone's mobile connection as a proxy for desktop browsers.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
PSLab

Pocket Science Lab Android interface for PSLab hardware
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
psychphinder

A searcher for the TV show Psych.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
PublicArtExplorer

Discover and view public art
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore
Pulsar

A simple BLE pulse meter (HRM - heart rate monitor) app.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pulse

Garmin watch companion — your data stays on your phone
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pulse

Plan your own weekly workouts and keep every exercise offline
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Punch-hole Download Progress

Xposed module showing download progress around the camera cutout
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Pushie

Provides temporary, secure, password sharing
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Puzzle Games

300+ minimalist brain games. Challenge your logic, memory & attention in game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Puzzle Grid

An app for drawing grids for select types of puzzles.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
PX:VW - converter

PX:VW is necessary tool for adaptive design
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
PxerStudio

Pixel drawing tool for Android.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
pyLoad

Manage remote downloads
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
PySolFC

PySolFC is a collection of solitaire card games
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Qadaa

Helps you to organize your missed prayers and fasting.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Qalculate!

Powerful and versatile multi-purpose calculator
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
qBitController

Remotely control qBittorrent from any device
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
qBittorrent Manager

Modern qBittorrent WebUI Client
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
QDict

A dictionary application for dictionaries in StarDict format.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
QED

Unofficial frontend for the web services of the QED e.V.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Qonvert

Converting rational numbers between different bases and representations
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
QQ Notification Evolution

Optimize QQ notification without ROOT
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
QR & Barcode Scanner

QR and barcode scanner with all the features you need.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
QR Code Displayer

Reconstruct damaged or blurry QR codes entirely on-device for easy scanning.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
QR Scanner (PFA)

(SECUSO) Privacy Friendly QR-Scanner with minimal permissions
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
QRAlarm

Disable alarms with a QR scanner
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
QRCode & Barcode scanner

QR Code & Barcode scanner cross-platform application
- Multimedia
- FOSS
- Free
- No ads
- Android only
F-Droid
QRieux - QR Scanner

QR scanner & creator. No ads, no tracking, works offline.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
QRshare

Generate QR codes on share intent
- System & tools
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid IzzyOnDroid GitHub Zapstore
QSO Again

Record and playback amateur radio QSOs with Audioloop and quick rewind.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore