FOSS apps: free and open source

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

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Rocinante

Fast, private, and native client for the BookWyrm literary social network.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Rocket Guardian

Do your duty and destroy the zombies
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
RomanDigital

Digital Clock App and Widget with Roman Numeral Display
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Romanian for AnySoftKeyboard

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

Roku remote
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Rootless Pixel Launcher

Launcher3 with Pixel Launcher features
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
RootlessJamesDSP

System-wide JamesDSP implementation for non-rooted devices
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Rosarium

Animated rosary app with a focus on UX supporting multiple languages
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Rosary

Help for praying the christian Holy Rosary (Spanish)
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Roue Libre

Bike sharing: offline map and journeys, with no tracker.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Round Sync - Rclone for Android

A file manager for Android, using rclone for the heavy lifting.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Router Keygen YoloSec

Generate default WPA/WEP keys
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
RowMate

Track your workouts on your FTMS rowing machine with real-time data.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Rowtine

Knitting and crochet app: patterns, stash, counters. Offline and free.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
RPClient

AI roleplay chat and story writing client
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
RPG NPC Generator

Generate random D&D-style NPCs for your tabletop RPG sessions.
- Games
- FOSS
- Free
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
RPN

Reverse Polish Notation Calculator
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
R
RPN

Very easy to use RPN Calculator
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
RPNcalc

A simple, modern calculator that uses RPN (Reverse Polish Notation).
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
RSAF

An Android Storage Access Framework document provider for rclone
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
rsend

Push phone folders to home SSH hosts with rsync over SSH
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
RSS Reader

Compact RSS reader with offline storage and background updates.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
RSSAid

RSSAid is a RSSHub assist tool built with flutter.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Rsync Server

A rsync server (alpha release)
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Rtl-sdr driver

Port of rtl-sdr's rtl_tcp
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
RTTT

Recursive Tic-Tac-Toe game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Ruam Mij

Suspicious app scanner with privacy respects
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Rubber Ring

A looper for practicing song parts.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Rucoy calculator

An unofficial calculator for all things Rucoy Online related!
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Rue:barbe -- modal split counter

Manually count passing bike, pedestrian and cars and calculate the modal split.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Ruffle

An Android application for ruffle.rs
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Rufid

Write and recover bootable USB media
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Ruler (Privacy Friendly)

(SECUSO) On the fly measurements with your Smartphone as ruler or protractor.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Rumble

Off-the-grid micro-blogging application for communities
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
RunnerUp

RunnerUp - an open source GPS tracker with advanced workout and audio cues.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Running Services Monitor

Monitor running services on your Android device with Root or Shizuku
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
ruNNNpe bridge

Automatic bridge from NPE RUNN to Health Connect.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Rush - Lyrics App

App to search, view and share lyrics
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Rush Hour

Mumbai suburban train timetable and live tracking
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Russian for AnySoftKeyboard

Russian Language Pack for AnySoftKeyboard
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
rust-keylock-android

A password manager with goals to be Secure, Simple to use, Portable and Extensib
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
RustDesk

An open-source remote desktop application, the TeamViewer alternative
- System & tools
- FOSS
- Free
- No ads
- Android only
F-Droid GitHub Zapstore
Rusyn for AnySoftKeyboard

AnySoftKeyboard Rusyn Language pack
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
RUTEdu

Interactive education app for chemistry, math and geography
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
RUTMath

A math learning app for children.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Rview

Gerrit code review client
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
RxDroid

Reminds you of your medication schedules
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
RZR

Beautifully made mobile code and markdown reader.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore