FOSS apps: free and open source

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

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Irregular Expressions

Virtual keyboard for writing expressive messages in various text styles
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Is it Prime

Prime number check.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
IsMyWebsiteUp

Handy tool to make sure your website is up, and alert you whenever it is down.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
IsPhoneEncrypted

Check if the disk is fully encrypted
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
I
iSpindle Plotter

Collect and plot fermentation data from an iSpindel hydrometer.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Israel 64 BDay Theme

AnySoftKeyboard theme for Israel 64th birthday.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Italian for AnySoftKeyboard

Italian language pack for AnySoftKeyboard
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Ithaka Board Game

Ithaka board game is played on a four by four square grid with three pieces in e
- Games
- FOSS
- Free
- No tracking
- Android only
F-Droid Zapstore
Itinerary Planner

Plan and manage travel itineraries.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
iTracing2

alternative application for iSee/iTag bluetooth device owners
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
iTrack workout tracker

Open-source workout tracker for managing your fitness routines
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Its Dicey!

Randomly select between friends.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
IVPN - Secure VPN for Privacy

Privacy focused VPN service with WireGuard
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore Accrescent
iyox Wormhole

Secure, open-source file sharing
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
IYPS - Is Your Password Secure?

Evaluate passwords, predict crack times, and get tips for stronger passwords.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
IzzyOnDroid (unofficial)

An unofficial client for IzzyOnDroid F-Droid Repository!
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore
J-K Bike - Mechanical Disaster Prevention

App that helps build positive bike maintenance behaviours, for rides quick, big
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
J-K Bike - Mechanical Disaster Prevention Pro

App that helps build positive bike maintenance behaviours, for rides quick, big
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
J2ME Loader

A J2ME emulator for Android.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Jamfish

Delicious native music player for Jellyfin, based on Gelli.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Jami

Share, freely and privately
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Jamu

An app to help learn Japanese
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
JaMuz

Audio Player synced with JaMuz Desktop
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Janken (Rock Paper Scissors)

Modern offline Rock Paper Scissors with private Pass & Play, Bot AI and RPSLS.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Janus Glossa

Contextual translations using Wikipedia's knowledge graph.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Japanese Traditional Time

Clock widget
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Jargon

Offline reader for the Jargon File, the original hacker culture dictionary
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Jargons Colombia

Brief dictionary of Colombian jargon.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Jass board

Very flexible Jass board to write points at the Schieber, Coiffeur, Molotov.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Java OOP Quiz

Tests Your knowledge of Java Object-Oriented Programming.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Jeden Tag ein Set

A free app for the electric music side jedentageinset.de
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
JekyllEx

The mobile IDE to create, build, edit, preview, and publish Jekyll sites.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Jellyfin

Mobile client for Jellyfin, the free software media system
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Jellyfin for Android TV

Television client for Jellyfin, the free software media system
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Jerboa for Lemmy

An app for Lemmy, a federated reddit alternative.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
JetBird

An unofficial, FLOSS, native Android NetBird client built with privacy in mind
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore
J
JEV 2022 Schedule

Conference program app for the JahresEndVeranstaltungen (JEV)
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Jigsaw

A Jigsaw Puzzle Game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Jigsaw Solitaire

A beautifully tactile, relaxing jigsaw puzzle game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
JioFi Battery Notifier

Battery Notifier for JioFi Device with battery Icon in Notification and Alerts
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Jiten Japanese Dictionary

Japanese dictionary based on jmdict/kanjidic (offline version)
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Jiten Japanese Dictionary [Online]

Japanese dictionary based on jmdict/kanjidic (online version)
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Jiyi

Encrypted audio logging app
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
J
JKU App

Provides information for the students of JKU Linz
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
JMdict droid

A Japanese to English dictionary, based on JMdict.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
JMP SIM Manager

Companion app for the JMP eSIM Adapter
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Jotdown

Offline PDF reader with OCR and academic annotations.
- Education
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Journal Multilingual

Open-source drug use tracker with interaction checker and multilingual support.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore