FOSS apps: free and open source

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

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SpamBlocker Extended (Call/SMS/Notification)

Spam Call/SMS/Notification blocker
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Spanish for AnySoftKeyboard

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

Sync RSS without a server using DecSync
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Spartathlon

View info about the Spartathlon foot race
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Spass

Small but effective password manager for android.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SPAYD Decoder

Offline decoder for Czech SPAYD payment QR codes.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Speaker

Bluetooth speaker fix: play background sound
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
SpeakThat!

The world's most comprehensive notification reader
- System & tools
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Specie

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

Radio frequency scanner with recon and offensive capabilities
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Spell4Wiki

Audio upload tool for Wiktionary words to Wikimedia Commons & Wiki-Dictionary
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Spelling Wizard

A fun and simple spelling app to challenge and improve your spelling skills
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Spickerrr

The motion app for party conferences of the pirate party germany
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Spider

This application enables you to connect to your SFTP server using a password or
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Spix - Privacy Fitness Tracker

Privacy-first offline fitness tracker with AI rep counter and gamification
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Split It Easy

Split bills with friends easily.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
SponsorCut

Remove sponsor segments from local video and audio files using SponsorBlock.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Spool Maker

Read and create NFC spool tags for UltiMaker 3D printers
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SpotIt

Music streaming advertisement muter
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Spotube

Lightweight & resource friendly music client
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SPRAWL//RUN

A running tracker wrapped in a cyberpunk story that chases you. Fully offline.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SQLiteViewer

A simple SQLite database viewer
- System & tools
- FOSS
- Free
- No ads
- Android only
F-Droid
SQRL Login

An implementation for SQRL (Secure Quick Reliable Login)
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Squawker

An open-source privacy oriented Twitter/X client
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Squealer

Explore SQLite databases
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Squeeze Client

Client application for Squeezebox players on the Lyrion music server
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Squeezelite

'Headless' audio player for Lyrion Music Server (LMS) - Squeezelite
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Squeezer

Remote control for Lyrion Music Server and players.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Squircle CE - Code Editor

Fast and powerful code editor & file manager for over 30 programming languages
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SrednaBG

Real-time average speed inside Bulgaria's average-speed camera zones.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SSH Remote

Use your smartphone to control your computer or HTPC
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SSHBorg

SSH & SFTP client for cyborgs and Android. No ads, no tracking, no cloud.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SshDaemon

Simple ssh/sftp server without root.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
ssrDroid

OverTLS & SSRoT Android client
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SSTV Encoder

Image encoder for Slow-Scan Television (SSTV) audio signals
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Stack Tower 3D

Stack sliding blocks into the tallest tower you can. One-tap 3D arcade.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
StageFever

Display stage notes, AMP/effect settings etc
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Stanley

An application explorer for developers
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
STARGW FX

A simple Foreign Exchange Rate Currency app. Free rates and no adverts.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
StarGW Weight

A free simple app to record your weight
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
S
Starke Verben

Learn the German strong verbs
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Starling

End to end encrypted location sharing. No accounts, no tracking.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
StartFlagExploit

Affected Android versions: Android 10 / Android 11
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Stashly - Vault tool

Stashly – A simple, secure way to manage your personal files and notes.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Stateful Speedometer

Stateful speedometer & GPS viewer
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Stately for NationStates

An unofficial app for NationStates — a political nation simulation game.
- Games
- FOSS
- Free
- No ads
- Android only
F-Droid GitHub
Status - Chat, Wallet, Browser

Privacy super app with messenger, crypto wallet, browser, communities & more
- System & tools
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Status Bar Speedometer

Displays your current speed in your status bar
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore