FOSS apps: free and open source

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

page 21

Cosmovisor

Spot satellites overhead in augmented reality
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
C
Couchy Launcher

A fast, private one-screen launcher
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Count for me

An interval timer you write, not one you just set.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
CountAway

A lightweight local countdown with home-screen widgets
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Counter

Simple tally counter for Android. It makes counting easier!
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
CountryCount

Track countries, visualize your progress, and explore where you’re going next.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Cover Fetcher

Vanilla Music player Cover Fetch plugin
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Cow's Revenge

Indie Platformer in Pixel Art Game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
CPU Info

Information about device hardware and software
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
CPU Stats

Compact CPU Usage Monitor
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Crate

Catalogue your physical media collection — stored on your own Nextcloud.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Crates.io unofficial

Rust crates.io browsing app
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
C
Crazyflie Client

Control your Crazyflie quadcopter from your mobile device
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Crescent Cash

Send coins to a Cash Account or Bitcoin Cash address with Crescent Cash
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
C
Critical Maps

Critical mass location sharing and chat
- Internet
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid Zapstore
Critical Velocity

Side scrolling arcade style game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Croatian for AnySoftKeyboard

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

Easily and securely send things from one computer to another
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
croc-app

Modern client for croc, easily and securely send files and text
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
crocson

Easily and securely send things from one computer to another
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Crossword

Simple crossword solver
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
CrossWords

A Scrabble-like game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Croustillapp

Access menus, addresses, and contact info for nearly 1,000 CROUS restaurants.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Crypto Prices

Track all of your favorite crypto prices
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Cryptocam - encrypting camera app

Take encrypted photos and video to protect sensitive information.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Cryptographic ID

Attest the trustworthiness of a device using asymmetric cryptography
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Cryptomator

Put a lock on your cloud: Take the security of your data into your own hands
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
CryptoPass

Strong passwords for different websites using a single secret key
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
CryptoSafe

Offline AES-256-GCM text encryption with Argon2id, no internet permission
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
CryptX

Simple Android Cryptography Toolkit
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Crystal Ball

Detects guitar chords and combines them into song sheets.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
C
CSV Editor

View and edit CSV files on your Android device
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
CTU Menza

Dish menus from CTU cafeterias, offers a modern UI and functionality.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Cube Run

Dodge, jump and slam through a neon 3-lane gauntlet. One-thumb 3D runner.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Cuberite

A lightweight, fast and extensible game server for Minecraft Java Edition
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
CubeTimer

Offline 3×3 speedcubing timer with TNoodle scrambles
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Cuppa - Tea Timer

Cuppa is a small application to time your cup of tea as it steeps.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
CUPS Printing

Print directly from your handset
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Currencies: Exchange Rate Calculator

An exchange rates currency converter for Android
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Currency

Currency conversion
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Currency Converter

CBR & market rates: my currency, favorites, offline cache, daily summary
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Cuscon

This icon pack adds variety and dynamism to your Home screen
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Custom Riddle Generator [small, no ads]

A tool app to create your own custom riddle apps (number->text/image).
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
Custom Routes

Mark custom climbing routes on gym photos and export shareable images.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Custom RR: ROMs & Recovery

Custom ROMs, recoveries & Treble GSIs for your Android, all in one catalog.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Custom Uploader

Upload files to a file host of your choice
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Cyclauncher

Ergonomic one-handed launcher with side alphabet grid, tags & widgets
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
CycleStreets

UK cycling navigation
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore