FOSS apps: free and open source

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

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S2TDroid Pro

Transform between Simplified Chinese and Traditional Chinese
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
SAF Media Scanner

Auxiliary program for the "Unpopular Music Player" and "Opus 1 Music Player"
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Safe Space

A safe space for your digital valuables.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SafeDot

alerts you when a third-party application uses your device camera or microphone
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SAI

SAI lets you install and export split APKs
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
S
Salasana

Generates site-specific unique passwords
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Salmon

An open-source guitar tuner that just works
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Salmon Tracker

Track official Alaska salmon counts and receive local update alerts
- Health & fitness
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid Zapstore
Salty

A secure, offline-first message encryption tool for Android.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
S
Sam Remote

Simple Wi-Fi remote for Samsung TVs
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
SambaLite

A lightweight, modern, and open-source Android client for SMB/CIFS shares.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Same

Two colors, nine fields. Make them all the same.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SanskritBasicsLetters

Learn Sanskrit letters in an easy way.
- Games
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Sapfir

SF2 sampler with recording and chopping
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Sapio

Android apps that respect you!
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Saracroche

Block unwanted spam calls and SMS, and protect your privacy
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Sardinian for AnySoftKeyboard

Sardinian language pack for AnySoftKeyboard
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SatDump

A generic satellite data processing software.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SatStat

GPS, sensor and network status
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Satunes

Satunes is a mp3 player developed by an organic intelligence.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SauceNAO

Unofficial SauceNAO client.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SavaPage Print Service

A Print Service for SavaPage Open Print Portal
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Save by OpenArchive

Safely preserve, organize, and share your mobile media
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Save Locally

Using an app that doesn't allow Saving but allows Sharing? No problem!
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Save on Device

Save shareable data to your device
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SaveAsTxt

Very small tool to save as txt from share menu of other applications
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SaverTuner

Extension to the built-in Android Battery Saver
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Sayboard

An open-source on-device voice IME (keyboard) for Android using the Vosk library
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Scale Practice

Scales and Arpeggios
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
ScaleLauncher

Use Xiaomi S400 locally via Bluetooth with openScale and Health Connect
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
ScanBridge
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SCEE

OpenStreetMap surveyor app for experienced OSM contributors
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
ScenePeek - TMDB & Seerr

TMDB & Seerr for Android
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SchildiChat Legacy

Secure messenger for Matrix with a traditional instant messaging experience
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SchildiChat Next

Next-generation SchildiChat Matrix messenger based on Element X
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Schlikk Calls

Change volume on call so that you don't miss them
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Schule

simple educational practice game for kids and adults: maths, clock, spelling
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Schulrechner

The calculator you know from school
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Scid on the go

View chess games
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
Score sheets

Result lists for many games
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Scoreboard

A simple app to keep track of player scores during any card game (or similar).
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
scorecounter

A simple score counting app
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
ScoreHub - Game Score Tracker

Track your board game scores easily
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Scrambled Exif

Remove the metadata from your pictures before sharing them
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Scratchpad Launcher

A minimal launcher with an always-visible scratchpad. Zero ads.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
scrcpy

Mirror a second Android device over wireless ADB. No root required.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Screen Off Timer

Clean sleep timer to stop media and lock screen.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Screen Time

Easily track the time you spend on your device and apps.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore