FOSS apps: free and open source

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

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Pollywog

Minimal utilities menu for the LeapFrog Epic
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
PolyAlerts

Price & % alerts for Polymarket prediction markets. Unofficial. No account.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Polymarket Viewer

Browse Polymarket prediction markets
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Pomfshare

Client for pomf.se
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Pomodorot

A simple timer which pauses when not in view
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
P
Port Authority

Port scanner
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Port Knocker

Port knocker client; supports one time sequences
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Port Knocker

Port Knocker Client
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Portio

Optimize batch cooking! Weigh meals and split portions based on each participant
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Portuguese for AnySoftKeyboard

Language pack for AnySoftKeyboard
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
P
Post Writer

A writing app for the true minimalist
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
pOT-Droid

Companion app for mods.de forum
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
POuL BITS

Get POuL headquarters status in realtime
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Power Ampache 2

Music Streaming suite for Ampache, Nextcloud Music and compatible backends.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Power App | Simple Power Menu [Root only]

A simple app with power options. Free, no ads and open source.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Power Button

Turn off your device without clicking hardware button
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Power Button Tile

Add up to 3 quick settings tiles to the quick settings layout
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Počasí v krajích

Short-term weather forecast for Czech Republic
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
PPSSPP

PSP emulator
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Practice Suite

The Swiss army knife of musicians
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Praktika Vortaro

Offline Esperanto dictionary
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Prav

Messaging for everyone, delivering privacy and freedom (powered by XMPP)!
- Internet
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid Zapstore
Prayer Book

Catholic prayers
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Prayer mode

Automatic Do Not Disturb for Islamic prayer times - Your Salah first.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Prayer Time Muter

Automatically silence your phone during prayer times
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Prediktor

Prediktor is a simple app for your everyday prediction needs.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Prepaid Balance

Keep track your prepaid balance
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
PrepApp (F-Droid)

Preparedness toolkit, survival guide, emergency info, weather and more.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Presence Publisher

Regularly publish to an MQTT topic
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
pretixPRINT

printing driver for pretixPOS and pretixSCAN
- Multimedia
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid Zapstore
pretixSCAN

Next-generation ticket scanning app for pretix
- Multimedia
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
PreviewMaker

Put watermark on a lot of photos
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
PReVo

Esperanto dictionary
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Price Per Unit

Find the best deal for the same item at different prices.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
PriceGrab

Compare two supermarket prices and find the cheaper one per unit.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Primary

A simple educational practice game for kids (and adults).
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Primitive FTPd

FTP server
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Principia

Physics-based sandbox building game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Print
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Priority Alerts

Informs you when receiving SMS matches with configured keywords
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Prism

Privacy-first UnifiedPush distributor with an optional self-hosted server
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid Zapstore
Privacy Browser

A web browser that respects your privacy.
- Internet
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid Zapstore
Privacy Cell

Verify that a phone is using the most secure cell protocols.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Privacy Flip

Manage your device privacy based on lock/unlock state
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Privacy Helper

An app privacy guide
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Privacy Indicators

Get notified every time an app or a service uses camera or microphone
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Privacy Kit Lite

Configure local privacy-related runtime hooks for LSPosed
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Privacy QR And Barcode Scanner

Fast, offline QR code and barcode scanner - no tracking, no ads
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore