FOSS apps: free and open source

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

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Status IM - Legacy

Connect Private Finance & Web3
- System & tools
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Stay Put - Unplug Alert

Stay Put helps prevent theft of your device while charging in public spaces.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore
Std Atmosphere

Engineering tool
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Stealth

Stealth is an account-free, privacy-oriented, and feature-rich Reddit client.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Steam Server Browser

Browse A2S-compatible Steam game servers on Android
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Stendhal Game

A multiplayer adventure with classic 2D graphics
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Step and Height Counter

Counting steps and elevation gain
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Stepsy: Step Counter

Your lightweight step counting buddy
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Sterna Mail

Private email client for JMAP and IMAP/SMTP. No Google services, no tracking.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Stethox

Xposed module that adds Stetho to every app
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Stims

Keep your screen awake while specific apps are in the foreground.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Stingle Photos

Stingle Photos is a secure, end-to-end encrypted gallery and sync app
- Productivity
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Stitch

Stitch screenshots
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
S
Stoic Reading

Consolidation of Stoic texts
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
StoneAge

A self-hosted P2P messenger - you will need an S3 bucket to use it
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
Stopptanz

Freeze Dance & Musical Chairs music timer, fully offline
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Stopwatch

Stopwatch as quick tile
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Storii - audiobookshelf client

Audiobookshelf client with downloads, accurate playback sync, and Android Auto
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
StoryGame

In this game the main goal is to make a story with the words you get.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
S
Stratum 0 Widget

Status Widget for Stratum 0, Hackerspace Braunschweig
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Streak

A minimal, private, ad-free habit tracker. One tap to log, watch streaks grow.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Streak Alarm for Snapchat (Streak Reminder)

Snapchat Streaks Reminder
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Stream Player

A simple HTTP stream player
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
StreamPlayer

Live internet radio and audio streaming
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
StreetComplete

OpenStreetMap surveyor app
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Stride

Task management tool that synchronizes with git.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Stroke Input Method (筆畫輸入法)

A minimalist Chinese keyboard.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
strongSwan VPN Client

An easy to use IKEv2/IPsec-based VPN client.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
StudFinder - Stud Finder for Android

Find wall studs with your Android's built-in magnetometer. Free, no ads.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Study Tracker

A simple and clean study progress tracker built with Jetpack Compose.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
StudyDesk

Know what to study next — a decision-free study tracker
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Stutter

Speed-reading app that shows one word at a time with adjustable timing
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SubSonicSter

Play Hitster card game with your own SubSonic music server
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Subster

Music timeline party game that plays songs from your own Subsonic library
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Subtitle Blocker

Overlay to mask hard-coded subtitles on videos and social media.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Subtracks

A music streaming app for Subsonic-API-compatible servers
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
S
Subz

Subscription and contract management with notification function.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Sudaku - Pattern-driven sudoku

Find patterns to solve sudoku - your sudoku workhorse handles the grunt work
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Sudoku

A clean Sudoku app with logic-based difficulty and helpful assists
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sudoku (Privacy Friendly)

(SECUSO) Privacy Friendly Sudoku without permissions or advertising
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sudoku You

Offline Sudoku with logical hints, advanced notes and flexible import/export
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
sudokunst

A sudoku game where you can draw the numbers
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SudoQ

Play many sudoku types, with many assistances, all offline.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SUD💜KU

A sleek and customizable Sudoku game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Sugarizer

Use Sugar learning platform
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Sumatora

Offline Japanese dictionary
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sumire Japanese Keyboard Lite F-Droid

Private offline Japanese keyboard with user dictionary and snippets
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Summit for Lemmy and PieFed

A fast and easy to use app for Lemmy and PieFed
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore