FOSS apps: free and open source

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

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OpenWrt Manager

Manage your OpenWRT device from your phone
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
openZinkBooth

An easy-to-use photo booth app for capturing and printing with HP Sprocket
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OPMT

A Strategy Board Game.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
OPNsense Manager

Manage OPNsense firewall: monitor, configure rules, view logs & services
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Opus 1 Music Player

Feature enhanced sibling of the "Unpopular Music Player"
- Multimedia
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid Zapstore
Ordunte: Karrantza weather

Weather at your location and four hyperlocal Karrantza/Ordunte sections
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Organic Maps・Offline Map & GPS

Get reliable offline maps with GPS navigation for hiking, cycling, and travel.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore Accrescent
Oriens

Roman Timekeeping (Unequal Hours) Widget
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
oRing - Reminder

Oring-Reminder is a thermal contraception manager
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Orion Master

Native 1oom port of Master of Orion (1993). Requires your own LBX files
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Orion Viewer - Pdf & Djvu

Orion Viewer is pdf, djvu, xps, tiff and comic books (cbr, cbz, cbt) file viewer
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Oscilloscope

Audio Oscilloscope and Spectrum
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Oshi Uploader

an Android app that can upload to any Oshi instance
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
OSM Dashboard (Offline)

OpenStreetMap dashboard for OpenTracks without internet permission
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore
OSM Dashboard for OpenTracks

OpenStreetMap dashboard for OpenTracks
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid Zapstore
osm2gmaps

Convert coordinates and map links between formats, services and apps
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
OsmAnd~

Global Mobile Map Viewing & Navigation for Offline and Online OSM Maps
- Navigation
- FOSS
- Free
- Paid
- In-app purchases
- No ads
- Android only
Google Play F-Droid Zapstore
OSMfocus Reborn

Examine OpenStreetMap (OSM) elements to "focus" your view of the map
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OSMTracker

GPS Track Recorder
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Osram Remote

An app to turn your phone into a remote for lights
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OSS Tracker

keep track of updates to Open Source Applications directly from the Repositories
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
OSS-Dict

Offline Dictionaries
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
OTG Master

Mount VeraCrypt and LUKS encrypted USB drives on non-rooted Android
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Otic

Minimal Android app to stream microphone input to the local network.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Otoscope

Ad-free viewer for WiFi otoscope cameras.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
OUI Lookup and Database

Find a device's manufacturer by its MAC address and browse OUIs assignments
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
OuterTune

Material 3 local Music Player and YouTube Music client
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Outfield

Remote control for Open Broadcaster Software (OBS).
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Outline

A VPN or proxy client
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Outline Keeper

The application for managing Outline VPN servers
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Overchan (fork)

Browse multiple imageboards
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Oversec

Privacy for All Apps! Encrypt and Disguise Messages in All Your Apps!
- Android only
Google Play Aurora Store F-Droid
OW Camera 2 For Pebble

Control your phone's camera remotely from your Pebble smartwatch
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
ownCloud

Add an ownCloud server now and get … Your Cloud, Your Data, Your Way!
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
OwnTracks

Your location companion
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
oxproxion

Chat with OpenRouter, Ollama, LM Studio and llama.cpp AI models
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
P.CASH Crypto Wallet

Bitcoin, Ethereum, Monero, zCash, Dogecoin, PirateCash, Cosanta, DeFi & more
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
P2Play - Peertube client

Unofficial Peertube client
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pachli for Mastodon

A full-featured Android client for Mastodon and similar servers.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Package Manager

A powerful application to manage your apps!
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
packlist

Manage packing lists
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
PadConnect

Turn your phone into a PC game controller
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Padland

Padland is a tool to manage, share, remember and read collaborative documents ba
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Pagan

A Mobile Music Sequencer
- Multimedia
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Pageless

Offline-first audiobook player for your self-hosted Pageless server.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
PAIesque

Privacy-first fitness tracker with end-to-end encrypted group sharing
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Pain Diary (PFA)

(SECUSO) Record condition, intensity, location, nature and time of your pain.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Paintball Notificator

…so that you no longer have to shout across the pitch before a match.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore