FOSS apps: free and open source

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

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Kefir Control

Minimalist app to track milk kefir, water kefir, and kombucha fermentation times
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kepler-App

App only in German! - App for the JKG Chemnitz with all important info
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Key Mapper

Make shortcuts for ANYTHING! Remap volume, power, keyboard, or floating buttons!
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Key Mapper GUI Keyboard

The official companion keyboard for Key Mapper.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Keyboard Switcher

Easily switch between virtual keyboards.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Keyoxide

Verify decentralized cryptographic identities on the go
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
KeyPass

Offline, Secure, Private
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Keysh

Volume buttons handler
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
KeyStoreViewer: App Signatures

Inspect app and APK signing certificates, fingerprints, and public keys.
- System & tools
- FOSS
- Free
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
KFZ-A

Offline lookup of Austrian vehicle registration identifiers
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
KFZ-D

Offline lookup of German vehicle registration identifiers
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
KFZ-Kennzeichen

Find german number plates.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Khushu

Private Muslim app for prayer, tasbih, study, and gentle reminders
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Kid3

Kid3 Audio Tagger
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
kiFOSSk

Lightweight FOSS kiosk browser for dashboards. Auto-recovery, zero Google.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Kill Camera

Kill camera related processes
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Kin Nai D

Let 'Kin Nai D' help you choose what you want to eat!
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kinetica

Two-thumb keyboard: both thumbs swipe and tap at once. No network access.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
King Pong

Retro Pong campaign with multiplayer and a secret ending
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
King Post

Share videos to YouTube, TikTok, Instagram, and other Android apps
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Kingdomino Score

Calculate your "Kingdomino" and "Kingdomino Age of Giants" score easily
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Kiosk

A Hacker News reader for Android.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
KISS Launcher

Blazingly fast launcher focused on search
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
KitchenOwl

KitchenOwl helps you organize your grocery life.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
kitshn (for Tandoor)

An unofficial client for the self-hosted Tandoor recipe management software.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Kitsune

Discover and track anime and manga on Kitsu, with feeds, groups and reactions.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Klick'r - Smart AutoClicker

Automating clicks based on what is displayed
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Klock

A simple chess based clock application
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore
KnightStalker

Open-source Stalker IPTV client for Android
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Knit

Encrypted mesh chat over Wi-Fi Aware & Bluetooth — no internet, no servers.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
knkpanime

Anime app with multiple source and danmaku support
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Knock on Ports

A powerful client to manage and run port knocking sequences
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Knot

Minimal memo/note app with only one note possible.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Kochi Transit Go

Offline Kochi Metro route planner and fare calculator. Fast, Free & Private.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kodi

Media center
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Koler

uniquely stylized phone app with customizable features
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Komelia

Komga media client
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Komi Store

App store for GitHub releases - discover and install apps with one click
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Komodo Wallet

Cross-platform cryptocurrency wallet and decentralized exchange (DEX)
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kompact Image Compressor

Offline image compressor, resizer and converter.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Kompanion

Remote control companion for KOReader e-readers
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Koofr Vault

Open source, client-side, zero-knowledge encrypted storage application by Koofr
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Kords

A ukulele chords dictionary and songbook.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Kore

Kore, Official Remote for Kodi
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
KOReader

Ebook reader
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Kotlin Quiz

Quiz taking application about Kotlin
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kotori

A simple speedmeter
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
KouChat

Chat
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub