FOSS apps: free and open source

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

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Sun Time

Align your biorhythm with the sun
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SunProxy

Set up packet redirect rules (proxy) by VPN
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sunrise Signal

Morning wood tracker app to gain health insights
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Suntimes

Sunlight and moonlight information (clock, alarms, tiles, and widgets).
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Sunup

UnifiedPush distributor using Mozilla's push server
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore Accrescent
Super Retro Mega Wars

Play retro games against each other in any combination.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SuperFreezZ: App stopper

Entirely freeze all background activities of apps.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SuperShopaholic

An infinite shopping cart in an infinite mall: a satire on consumerism
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SuperSMP Companion

Vote, shop & explore SuperSMP anywhere! Companion app for server features
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Supertonic TTS

Local AI Text-to-Speech using Supertonic ONNX
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SuperTuxKart

A 3D arcade racer with a variety of characters, tracks, and modes to play.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SuperX Video Downloader

Video downloader with browser for downloading videos from everywhere
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Survival Manual

Learn how to survive
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sushi - Personal Finance

Keep track of your own finances
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Svarka Odds Calculator

Calculate odds and probabilities for the Bulgarian card game Svarka
- Games
- FOSS
- Free
- No tracking
- Android only
F-Droid Zapstore
Swap

Share files on LAN from Android to any browser
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Swatch .beat clock

Internet Time clock and converter
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SwatchIt

Manage your knitted swatches
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Swedish for AnySoftKeyboard

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

Run and manage an IPFS node from your device
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
SwiftSlate

System-wide AI text assistant — type a trigger, get instant text transformation
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Swiss Bitcoin Pay

1 minute to accept Bitcoin in your business.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SwpieView

Minimalist image viewer with GIF support
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Symphony

Offline music playback is now a breeze
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
SyncMemories

Sync photos fastly using USB capability
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
S
Syncopoli

An rsync client that works
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SyncRecord

Create synchronised ad-hoc microphone arrays using multiple smartphones.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Syncthing-Fork

Wrapper for Syncthing - Open and decentralized file synchronization
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Syncthing-Lite

Browse Syncthing shares
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SyncTool

Synchronize data between a smartphone and a server
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SyncUp

An open-source Syncthing client for iPhone and Android.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SysLog

Capture log files
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
T CrB Detector

T CrB Detector notifies the user when the star T CrB has exploded.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
T16Fling

A keyboard controlled with touch gestures on 16 large keys
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
T2DECODE

Offline interactive learning platform for IT, Cybersecurity, and Networking.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
T4 Launcher

simple launcher with predictive text filtering
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Tabata Xtreme

Tabata-style workout timer with a sneaky little twist - a variable time base!
- System & tools
- FOSS
- Free
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
TabGreater

Crypto watchlist with live prices, charts and home-screen widgets
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
TABI

Japanese from zero in five minutes a day. Kana, phrases, signs, trains.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Table Habit

Boost your own habit growth with charts.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
T
Tableau de bord Rolling

A dashboard for Rolling game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Tabletop Tools

Handy tool collection for tabletop games
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
TacticMaster

Chess tactic trainer based on https://database.lichess.org/#puzzles.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
tagdrop

Decode data URIs in QR codes
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Taiga Mobile Nova

Unofficial Android client for Taiga.io project management
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Tailscale

Mesh VPN based on WireGuard
- System & tools
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Taison

Manga reader for organization and clear oversight
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Taler Point-of-Sale Terminal

Process orders and take in Taler payments
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore