FOSS apps: free and open source

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

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phyphox

Perform physics experiments with your phone. (by the RWTH Aachen University)
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Pi-hole Droid

Unofficial client that connects to your Pi-hole to show charts and statistics
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
PianOli

Baby game to keep your device safe from random baby-taps
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Picard Barcode Scanner

Simplifies tagging your CDs and LPs with MusicBrainz Picard
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
PicCollage

High-performance photo collage studio with 26 dynamic gradients and pro layouts.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
PicGuard

Your pictures, your signature.
- Multimedia
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Picocrypt-NG

Paranoid, offline file encryption with XChaCha20 and Argon2id.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
PicoStreamingApp

Minimal RTMP streaming app.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pictionary Generator

A Pictionary-ish Word Generator
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pie Launcher

Control your phone with a dynamic pie menu instead of fixed positioned icons.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Piedmontese for AnySoftKeyboard

Piedmontese language pack for AnySoftKeyboard
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Piggsy

Piggy banks for tracking your goals
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
piggybudget

Easily track your expenses
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
PiGrid Companion

Gridcoin Stakebox Companion App
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Pilagá for AnySoftKeyboard

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

Organize your documents with tags. Private, offline, and built for you.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
PilferShush Jammer

Block unwanted use of onboard microphone
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
PiliPala

A third-party Bilibili client developed in Flutter
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Pill Time

Keep track of meds that can be taken as needed (not at a specific time)
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Pimi widget

Your day, at a glance - with built-in weather app
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
PIN Mnemonic (Privacy Friendly)

Helps you to memorize PIN codes
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
PINcredible - Secure PIN vault

Modern and secure Android app to help you remember any PIN
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
PinDroid

Bookmark manager
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
Pineapple Lock Screen (OSS)

Help you turn your phone screen off (lock screen) without using power button.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
PingOff

Silence your phone automatically when using selected apps.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
PinPoi

Import and manage points of interest
- Navigation
- FOSS
- Free
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Pinpoint - Personal POI Mapping

Map things/points of interest in your surroundings and across the globe
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Pinyin Web & EPUB and topolects

Adds Pinyin or Cantonese etc to websites and EPUBs
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pioneer

Open source universal progress tracker
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
PipePanic

A plumbers favorite game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
PipePipe

A FLOSS Android app to let you browse YouTube, NicoNico and BiliBili freely.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
PiPixiv

Third-party Pixiv Client
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Pirate Solitaire

Custom variant of the Free-Cell solitaire with pirate themed cards in pixel art.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pitak

Privacy-first offline library catalogue with an encrypted lending vault
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pitch Pipe

Provide a pitch reference for musicians
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Pitch pipe

Simple instrument pitch pipe
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
PitchVis

Real-time visualization of musical pitches from live audio
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Pix-EzViewer

A third-party Pixiv Android client. (Android 5.0+)
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Pixel 5G

Config pixel modem NR mode
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Pixel Artist

Create pixel art on a 16 x 16 grid screen
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Pixel Tag Drawer

Organize and launch Android apps with tags and usage-based sorting.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Pixel Wheels

A top-down retro racing game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
PixelDroid

Client for Pixelfed, the federated image sharing platform
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
P
pixelflood

Pixelflut server
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Pixelix

A mobile client for Pixelfed and Vernissage
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
PixelKnot: Hidden Messages

Have a secret that you want to share? Why not hide it in a picture?
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
PixelPlayerOSS

Local-first Android music player for offline and self-hosted libraries.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pixiv for Muzei 3

Best Pixiv plugin for Muzei 3
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore