FOSS apps: free and open source

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

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Snapcast - multi-room audio in perfect sync

Snapcast client for Android
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore
Snapdrop & PairDrop for Android

Transfer files seamlessly between all your devices - Snapdrop
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SnapSafe

Snap pics of anything, safely.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SnapSaver

An app to quickly take photos and organize them into specified directories.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Snikket

Personal messaging app for groups, with a self-hostable open-source server
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SnoopSnitch

Check mobile network security
- Security & privacy
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid
Snore Detector

Detects snoring during sleep and records snore events.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Snow

A monotone icon pack.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Snowdrop

Multiplatform client for Mastodon API compatible fediverse software
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Snowflake Volunteer

Help people in censored countries access the Internet without restrictions
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Sobriety

Track your addictions and maintain sobriety!
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Sobuu

Track books reading and organise your readings
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid Zapstore
Social Deduction Game

Offline game-master assistant for Werewolf, Mafia and social deduction games
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SocketChat

A simple app to chat with anyone you want on the same network.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Socks5 Proxy

Socks5 client based on VPN
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SocksTun

A simple and lightweight VPN over socks5 proxy (tun2socks)
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Soft Sound

Play relaxing sounds
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SoftPlus Options

Offline-first, privacy-focused options payoff and volatility surface simulator.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Sokoban(g)

Sokoban puzzle game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Solar

Solar is an app to monitor off grid solar setups over bluetooth.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Solid Share

Files, contacts and passes on your own Solid pod, shared on your terms
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Solipsism Browser

Rail-first browser with privacy tools and one-handed controls
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Solitaire (Privacy Friendly)

(SECUSO) Privacy Friendly Solitiare is a Klondike Solitaire Game.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
SolitaireCG

Solitaire Card Games
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Solo Forge

Local-first intermittent fasting, calorie, weight & workout tracker
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Solon

A light-weight Android frontend to SkolaOnLine
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
solXpect

solXpect forecasts the output of your solar power plant
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Songhay for AnySoftKeyboard

AnySoftKeyboard Songhay Language pack
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Soothing Noise Player

Play soothing sound effects to help you relax and drown out background noise.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SOS Alerter

Privacy-focused emergency app with SMS location tracking and silent recording.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SOS Flashlight: Advanced Morse Code Tool

Turn your phone into a Morse code device, to transmit emergency messages.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
SOS Ring

Make VIP calls and messages audible even in Silent/DND
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sossoldi

Sossoldi is a wealth management and tracking app
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Soul Searching

A complete and powerful music player for Android.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
SoulCalc

Notepad-style calculator with variables, line references, multi-line support
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sound Center

Local music, podcast, stream and cloud player, built to enhance your quality of
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sound Quick Settings

A simple Quick Settings Tile to control the sound volume.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Sound Recorder Plus

A basic sound recorder app for Android.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Sound Toggle

quickly switch the audio mode of your device
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
SoundAura

A background audio player for studying / working.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SoundBored

Make your friends laugh with several great free sound effects
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SoundPod

A minimalist music streaming app
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SoundRemote

Listen to audio from your PC and control it from your phone
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
SoundTree Recorder

Audio recorder with topic organization, marks, and page-like waveforms.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Souvenirs

Make photo albums and share them on Nextcloud. Support for image, sound, video,
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Space Vertex Multiplayer

Have you ever played a Cat and Mouse game with your friends ... in Space?
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SpaceBeam

Kaleidoscope Camera Fun with Shaders for live visual performances!
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SpamBlocker (Call & SMS)

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