FOSS apps: free and open source

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

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koyu.space

Stay connected with the fediverse
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
krassesSpiel

A little Game where you shoot bullets at squares
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Krautschlüssel

Control Krautspace's door
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Kreate

A multilingual YouTube Music frontend for Android, prioritize performance.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Krita

Professional painting program
- Multimedia
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
Kryfo

private messages over tor. no phone number, no account, no metadata trail.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Nostr
- Android only
F-Droid GitHub Zapstore
KryptEY

Keyboard for secure E2EE communication through signal protocol in any messenger
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub
Kryptos

Encrypt inside any messenger: the keyboard encrypts, the screen decrypts
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
KTrip

Public Transport Assistant
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Kuaizi IME

Kuaizi IME is an efficient and fast Chinese Pinyin input method editor.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
KUKSA Companion App

The Companion App for the KUKSA Databroker.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kumquats

Place letters to create intersecting words as quickly as possible.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Kurdish for AnySoftKeyboard

AnySoftKeyboard Kurdish Language pack
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Kvaesitso

A search-focused, free and open source launcher for Android
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Kwik DEM (ant.spl)

Kwik EFIS terrain data - Antarctica, South Pole
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kwik DEM (eur.rus)

Kwik EFIS terrain data - Europe, Russia
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kwik DEM (pan.arg)

Kwik EFIS terrain data - South America
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kwik DEM (sah.jap)

Kwik EFIS terrain data - North Africa, India, Indonesia, Japan
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kwik DEM (usa.can)

Kwik EFIS terrain data - North America, Canada
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kwik DEM (zar.aus)

Kwik EFIS terrain data - Southern Africa, Australia, New Zealand
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kwik EFIS

Aviation Glass Cockpit / EFIS with ADS-B Traffic display
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Kwik EFIS (E-Ink)

Aviation Glass Cockpit / EFIS with ADS-B for E-Ink devices
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
KyuubiMask - Privacy First

Privacy-focused notification masking for screen sharing and presentations
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Kõnele

Speech-to-text provider
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
L5RCM Companion

Play-at-the-table sheet viewer for L5R 4E characters
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
L9
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
La et Le

Train French noun genders using spaced repetition
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
la/u/ncher

The official app for danger/u/, dangeru.us
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
LaaNo

Bind notes to links and sync them with Nextcloud
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Lab+ for Gitlab

Your unofficial Companion for Gitlab
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
LabCoat

GitLab client
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
LaBLEr

Design labels and print them on a P15/P12/L13 Bluetooth thermal printer
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
LabLog

A digital lab notebook with MQTT
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
LabNex for GitLab

Android app for GitLab
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Ladefuchs

Shows the cheapest charging card - with only one swipe at the charging point.
- Internet
- FOSS
- Free
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Lalumo

Kids learn music with animal friends, melodies, and puzzles - playful and colorf
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Lane's Lexicon

An Arabic English Dictionary
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
Language Dex

Create custom dictionaries and retain words with puzzles.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
LANShield

Protect your LAN by managing app access to your local network.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Last Launcher

Minimal text-only launcher focused on speed and simplicity
- System & tools
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid Zapstore
Latarka

Toggle flashlight with a shake gesture
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
LatentJam

Local music player with an on-device recommender. No account, no network.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Latin Defense

Expand your own Roman Empire!
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Lato

A downhill snowboard game with beautiful graphics
- Games
- FOSS
- Free
- No tracking
- Android only
Google Play Aurora Store F-Droid
Latvian for AnySoftKeyboard

AnySoftKeyboard Latvian Language pack
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Launch - Minimalist Launcher

A clean, efficient, and minimalist Android launcher.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Launch Chat

Start a WhatsApp, Signal or Telegram chat without saving a number as a contact
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Launch on Boot

Launches an application when the device boots
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid