FOSS apps: free and open source

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

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OpenComicVine

Comic Vine client, website on comics
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
OpenConnect

Android UI for OpenConnect VPN client
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
OpenContacts

A different database for contacts to keep them private only to you.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
openCook

Recipe manager to scan cookbook photos, plan your week and share the list
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenDefault

Help opening URLs with default App
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenDNS Updater

OpenDNS Updater is an extremely easy to use android app to perform IP updates.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
OpenDocument Reader

Document reader & file editor for Libreoffice & OpenOffice | ODF: ODT, ODS +more
- Education
- FOSS
- Free
- In-app purchases
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
OpenDrummer - Drum Loops

Drum loops in different styles and tempos.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
openDSP-4x4

Open control for the t.racks DSP 4x4 Mini Pro over USB-OTG.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenFoodFacts

Look up food ingredients, allergens, nutrition facts
- Health & fitness
- FOSS
- Free
- No ads
- Android only
F-Droid GitHub Zapstore
OpenFool

Russian national Fool (дурак) card game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
openHAB

Vendor and technology agnostic open source home automation
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
openHAB Beta

Vendor and technology agnostic open source home automation
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenHub

A GitHub client app, faster and concise
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
OpenKeychain: Easy PGP

Encrypt your Files and Communications. Compatible with the OpenPGP Standard.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
OpenKuma

Read-only viewer for your Uptime Kuma monitors. Private, no ads, no tracking.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Openlib

download and read books from shadow library (Anna’s Archive)
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
OpenMensa

Show meal plans for more than 150 university canteens in Germany.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
OpenMoneyBox

Budget management application
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
OpenMultiMaps

Display maps with OpenStreetMap
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
OpenOdo

Private offline vehicle logs, reminders, fuel and expense history
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenPaperView

An OpenPaper.work mobile companion designed to be usable offline
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
OpenPhotoFrame

Turn your old Android tablet into a beautiful digital photo frame.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenPillReminder: Birth Control Pill Tracker

Open source lady pill (birth control) tracker
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
OpenPods

The Free and Open Source app for monitoring your AirPods on Android
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Openreads

Private and open source books tracker, organizer and reading list.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
OpenRedmine

Redmine client
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
openScale

Weight and body metrics tracker, with support for Bluetooth scales
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
openScale sync

Synchronize your openScale measurements with external services
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Openshelf

Free, open-source personal library manager and book tracker.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenShift

Adjust screen color values
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
OpenSound

A simple module that can be use to easily open any sound file, from any app.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
OpenStop

The app for collecting barrier data in local public transport.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
OpenStud for InfoStud

Unofficial client for Sapienza University's InfoStud
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
OpenSyncedLists

Sort, tag & sync your lists – encrypted on your own server.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
OpenTasks

Keep track of your list of goals
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
OpenTopoMap Viewer

Online client for maps from OTM project, import GPX and show own location
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
OpenTracks (Non-reproducible)

A sport tracker buddy that respects your privacy.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
OpenTracks (Reproducible build)

A sport tracker buddy that respects your privacy.
- Health & fitness
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid Zapstore
OpenTTD

A simulation game based on the popular game "Transport Tycoon Deluxe"
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
OpenTune

A YouTube Music client with Material Design 3, for Android
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
OpenUSOS

An open source unofficial USOS app, for students in Poland
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenVine

Record and stitch 6-second video clips. Offline and private.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenVitals

Private Health Connect dashboard. No account, no cloud, no ads.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
OpenVK Legacy

OpenVK Legacy is mobile client for retro devices running Android >2.1.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
OpenVPN for Android

OpenVPN without root
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
OpenWebWeaver

Interact with WebWeaver based online learning platforms
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
OpenWOL

OpenWOL is a simple, private and efficient Wake-on-LAN app for Android.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore