FOSS apps: free and open source

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

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SpeedyNote

A blazing-fast, cross-platform note-taking app for stylus users
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
splitcat

Simple flutter app for spliting and merging files with predefined application limits
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
SpMp

Note: Mostly non-functional, see README --- A YouTube Music client with a focus on customisation of colours and song metadata.
- Productivity
- FOSS
- Free
- Android only
Zapstore
Sshd4a

An Android 'sshd' server with shell access, rsync and scp/sftp services.
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
Staging KeyPass

KeyPass: Open Source Project & An Offline Password Manager. Store, manage, and take control securely.
- Android only
Zapstore GitHub
StashPay

A minimalist Bitcoin wallet for everyone. Built on Lightning & Liquid ⚡️
- Finance
- FOSS
- Free
- Android only
Zapstore
stasis

A stasis) */ˈsteɪsɪs/* or stasis field, in science fiction, > is a confined area of space in which time has been stopped or the contents…
- Android only
Zapstore IzzyOnDroid GitHub
Stay-Awake on ADB

A simple Android app to listen for ADB connection notification and enable/dissable the Developer Options "Stay Awake" setting.
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid
Stoic Reading

Consolidation of many Stoic texts
- Education
- FOSS
- Free
- Android only
Zapstore
Substratum Tweaks

A substratum "theme" to tweak Android's resource values on recent android versions.
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
Subway Tooter

Mastodon client for Android 8.0 or later.
- Communication
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store GitHub
Sunmachine

Sunmachine is an application to control smart lighting system.
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
SupIR

SupIR is an open-source general-purpose IR blaster for Android using the irdb database.
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
Sure Finances

involved: Discord • Website • Issues
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
Surge Engine

Make your dreams come true! Open Surge Engine is an open-source 2D retro game engine designed to make your dreams come true!
- Games
- FOSS
- Free
- Android only
Zapstore GitHub
Sync Settings

Create Locale/Tasker actions to apply specific sync settings.
- System & tools
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store IzzyOnDroid GitHub
Syncara

Sync YouTube playlists offline. Because YT Music \
- Multimedia
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
Syncthing-Fork

🚀 Major Upgrade to Syncthing Version 2
- System & tools
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store GitHub
SystemUI Tuner

SystemUI Tuner is an app for viewing and modifying hidden settings on Android devices.
- Android only
Zapstore Google Play Aurora Store IzzyOnDroid GitHub
TachiyomiSY

| Preview Builds | Release Builds | Mihon Support Server | |-------|----------|----------| | | | [![Discord](https://img.shields.
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
Tchap Classique

Tchap is an instant messaging service intended for communications by French administration agents, to exchange information on the move or…
- Internet
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store
TDX

TuneDetectiveX, the follow-up of the OG TuneDetective App for Android. Use this app to get notified for new music releases of your fav.
- Multimedia
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
Telegram

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
- Communication
- FOSS
- Free
- Android only
Zapstore
Telewatch

English | 简体中文 | 繁體中文 | 日本語
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
T
Template

A collection of small Xposed Modules.
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
Tempo

Tempo is an open-source and lightweight music client for Subsonic, designed and built natively for Android.
- Multimedia
- FOSS
- Free
- Android only
Zapstore GitHub
Test DPC

Please note that this app is for development purposes only. It is NOT intended for production usages.
- Productivity
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store IzzyOnDroid GitHub
Thunder

Thunder is a fully open source, cross-platform, community-driven project available on GitHub. Fully free of advertisements and trackers.
- Communication
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store IzzyOnDroid GitHub
Tiddloid Lite

Tiddloid Lite, a lightweight version of Tiddloid, is an app to work with locally stored TiddlyWikis.
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
Titanius Launcher

Titanius Launcher is a minimalistic, controller-first retro game launcher designed for those who want to enjoy a seamless gaming experience…
- Games
- FOSS
- Free
- Android only
Zapstore GitHub
TLSFragment

TlsFragment to Bypass GFW.
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
Todopad

This is a FOSS todo app with local backup and restore functionality made with flutter.
- Productivity
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
Transcribro

Transcribro is a private and on-device speech recognition keyboard and service for Android.\ It uses whisper.cpp to run the OpenAI Whisper…
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub Accrescent
Transfer

Transfer makes sharing files across your local network incredibly straightforward.
- System & tools
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store IzzyOnDroid GitHub
translationRecorder

Designed to give mother-tongue oral-only translators a tool for recording scripture audio content, translationRecorder focuses on a simple…
- Multimedia
- FOSS
- Free
- Android only
Zapstore
T
Translucent Shade

You can make elements of Notification Shade transparent with this LSPosed module.
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
TrustDevice Fingerprint

Leading open source version of android device fingerprint, accurate deviceID and risk identification.
- System & tools
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store IzzyOnDroid GitHub
Tuta

Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all…
- Communication
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store
Twine

Twine is a modern cross-platform RSS reader app built using Kotlin and Compose Multiplatform.
- Internet
- FOSS
- Free
- Android only
Zapstore GitHub
Umihi Music

A lightweight Material YouTube Music player for Android, built with Kotlin and Jetpack Compose.
- Multimedia
- FOSS
- Free
- Android only
Zapstore GitHub
Units

Units is a powerful unit-aware calculator that can perform a variety of unit conversions and also doubles as a simple scientific…
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
Untare

You can use the app as long as it works with the new Tandoor versions.
- System & tools
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
UpVPN

UpVPN is the world's first Serverless VPN. The VPN app is available for macOS, Linux, Windows, tvOS, iOS, and Android.
- Android only
Zapstore Google Play Aurora Store
URL Radio

URL Radio is a fork from Transistor. URL Radio is an application with a minimalist approach to listening to radio over the Internet.
- Multimedia
- FOSS
- Free
- Android only
Zapstore IzzyOnDroid GitHub
USB Serial Telnet Server

Just connect a USB serial adapter into USB OTG port of your Android device, start this app and connect to it using any Telnet client like:
- System & tools
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store IzzyOnDroid GitHub
V2EX

A simple android client for exploring V2EX. Excellent user experience. Project is first written by Java and now kotlin.
- System & tools
- FOSS
- Free
- Android only
Zapstore
Vectras VM Github

Vectras VM is a QEMU-based virtual machine app for Android.
- Games
- FOSS
- Free
- Android only
Zapstore GitHub
Vela Maps

Maps and turn-by-turn navigation for Android without Google Play Services: the best of open map data, with Google lookups by choice.
- Navigation
- FOSS
- Free
- Android only
Zapstore GitHub