FOSS apps: free and open source

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

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Screen Time

Display your screen time in a permanent notification
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
ScreenCam

Lightweight and functional screen recorder
- Multimedia
- FOSS
- Free
- No ads
- Android only
F-Droid
Screenshot Tile (NoRoot)

Customizable screenshot tool with quick settings shortcut and floating button
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
ScreenStream

Screen streaming over HTTP
- Multimedia
- FOSS
- Free
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Screeps

Web based client for Screeps
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Screw Jam

Unscrew plates, match colors with active toolboxes
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Scrib

A simple text workspace to edit text before pasting somewhere else.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Scrib

On-device voice transcription. Your audio never leaves your phone.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Scribe4

Scribe4 is a logical game developed by Mark Steere.
- Games
- FOSS
- Free
- No tracking
- Android only
F-Droid Zapstore
ScrubPony

Strip GPS and metadata from JPEG, PNG, WebP and HEIC photos, on your device.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Scrum Chatter

Time members while they speak at meetings
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
Scrunch

Play sounds whenever you fold or unfold your Galaxy Z Fold.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SD Contacts

Automatically store your contacts to your SD card
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SD Maid 2/SE - System Cleaner

A trusted assistant for your Android, to keep it clean and tidy.
- System & tools
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
SDAI - Stable Diffusion AI

Open-source Stable Diffusion client for Android and iOS workflows.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SDB Viewer

View song lyrics, a translation of it and guitar chords
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SDCard StoryTeller

Play stories in Lunii® format from the SDCard
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
SDK Monitor

Display and monitor the targetSDK from installed apps
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SDRemount

remounts the SD Card to allow write access
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid
Seafile

File synchronization
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Seafood Berserker!

Help the Vikings repel a fish attack!
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Seal

Video/Audio downloader designed and themed with Material You
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Seamless

Offline speech to text translator
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Search to browser

Forward GLOBAL_SEARCH intents to your default browser
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
SearchLauncher

Search apps, contacts and the web, and open results in an ad-free browser
- System & tools
- FOSS
- Free
- No ads
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
searxist

Search with SearXNG natively on Android.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Secluso

Private home security for Raspberry Pi and Secluso hardware
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
SecondsClock

Clock with seconds as widget or fullscreen
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
SecondScreen

Better screen mirroring
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Secret Space Encryptor (SSE)

File Encryption, Text Encryption (Messages, Notes, …), Secure Password Manager
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SecScanQR

The QR code scanner/generator that cares about your privacy
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Secur: Cross-platform 2FA client

A beautiful, cross-platform 2FA TOTP client written in Flutter
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Secure photo viewer

A media-viewer that functions ontop of your lockscreen
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Secure QR Share

Share passwords and links securely via encrypted QR codes.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SecureOTP - Universal OTP Extractor

Auto-detect and copy OTP codes from SMS, Email, and app notifications
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SecureScreen

Protect selected apps from screenshots and screen recording
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SecureYourChats

Text & File Encryption/Decryption with new OverlayTechnology
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
SeekPrivacy

Activist-Grade Defense Against System-Level Data Surveillance
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Seenema: Movie Tracker

Track and rate the films and series you have watched. No account, no ads.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Seeneva: smart comic reader

Fully open source smart comic book reader with the ability to use OCR and TTS.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Seguime

Follow where your device goes without being followed by you
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Sehat

Sehat (Urdu for health): Track steps, heart rate, and meditation, all privately.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Sekreto
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Select Text to Search

Add a "Web search" action to the text selection toolbar
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Self Attendance Tracker

Attendance Tracker for students with focus on UI and usability
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
SelfPrivacy

Self-hosted services without pain
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
SELinuxModeChanger

Set SELinux mode on boot
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Semitone

tuner, metronome, and piano
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid