FOSS apps: free and open source

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

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Bugbane Beta

Beta channel of Bugbane, a guided forensic self-triage tool for Android
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Bulgarian for AnySoftKeyboard

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

Scoreboard for tournament dart x01
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Bummerlzähler

Fetziger Bummerlzähler für jeden der nicht überall einen Zettl hat
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
Bunny Media Editor

Media editor: edit images and videos on your phone
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Bura

Modern weather app with graphs and thoughtful data visualization
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Buran

Simple Gemini browser for Android
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Burger Party

Are you fast enough to put together the burgers ordered by your customers?
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Buses

Geographical GB bus times lookup app
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
BusTO

BusTO gives you arrival times for public transport in Turin and its outskirts
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
B
BusyBox

Install a compact but feature-complete version of basic Linux command line utils
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
BusyBox Installer

A one-click BusyBox installation utility for Android!
- System & tools
- FOSS
- Free
- In-app purchases
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub
BuzzKill

Powers off your phone after inactivity, only inside a nightly kill zone.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
BVD

bilibili video resource downloader
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
BwareArea

An offline GPS based POI alerter with overlay
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Bépo clavier externe

bépo pour clavier externe
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
c-beam

Android interface to the c-base onboard computer c-beam
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
C2K — Couch to 5K & 10K

Offline C25K & C210K trainer with voice coaching. No ads, no tracking.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
C
c3nav

Indoor navigation for the Chaos Communication Congress
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Cache Cleaner

Clean cache of installed user and system apps using Accessibility
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
C
Cache Cleaner Widget

A root-based widget with no UI that clears all app caches in one tap.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Caff

Quick settings tile providing caffeine mode functionality (keep display on)
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Caffeinate

keep your phone's screen On while developing
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Caffeine Health

Track your caffeine. Protect your sleep. Real-time pharmacokinetic curves.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Cairn: Health Aggregator

Aggregate your health data into open files in your own Nextcloud
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
CajuScan

Record invoices in the Cashew app by scanning the QR code on Portuguese invoices
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Calculate

train mental calculation
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Calculator

A Soft UI Calculator
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Calculator M3

Clean, private calculator — no tracking, no ads, optional on-device AI.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
C
Calculator Notification

Move your Calculator into the notification drawer
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Calculator You: Math & Units

Calculator You is a beautiful calculator for solving simple tasks.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
C
Calculator++

Scientific calculator with sleek interface and powerful capabilities
- Android only
Google Play Aurora Store F-Droid
CalcYou

Privacy Focused Calculator app built with MD3
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Calibre-Web-Companion

Unofficial companion app for calibre web (automated)
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Calisthenics Memory

Bodyweight workout tracker - create and customize your own exercises
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid Zapstore
C
Call Blocker

Block unwanted calls, spam and telemarketing
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Call Counter

Control of the Plan of outgoing calls and sent sms
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Call Limiter

Limit call duration per contact and automatically hang up when time is up
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Calliope mini

Hacking, tinkering, coding - create your programs on the go!
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
CallScope

Local-first call log analytics
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Calorimeter

Track your calories!
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Calyx - Grow Tracker

Track indoor gardens, plant schedules, and hardware entirely offline.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Calyx VPN

Free VPN Service offered by The Calyx Institute
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Cambium

NIP-55 signer that holds no keys: signing is proxied to a NIP-46 hardware bunker
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Camera Date Folders

Sort photos from camera folder into a date specific subfolder structure
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
C
Camera Folder

Allows all jpg apps to take a photo from the camera and process it.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
C
Camera Silencer

Reduce camera audio only while a camera is active
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
CameraAlign

Align your phone with a previously taken photo
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore