FOSS apps: free and open source

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

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Mempal

A Bitcoin mempool monitoring and notification app for Android.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
M
Mensa-Guthaben

Check balance of NFC mensa cards
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
MensaPlan

Information for canteens at KIT, HS Pforzheim, etc
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
mensen

Access the menu of Dresden's canteens.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Mensinator

Tailored Period Tracking, Total Privacy—Your Period, Your Control.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Mental Math

Practice mental arithmetic solo or compete with friends.
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Mercurygram

Telegram is a messaging app with a focus on speed and security.
- Internet
- FOSS
- Free
- No tracking
- Android only
F-Droid GitHub Zapstore
M
Mercurygram Tor Plugin

Tor companion plugin that routes Mercurygram traffic through the Tor network
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
MergedWiFiNLP

A UnifiedNlp backend
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Meritous

Dungeon crawl game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Meron

Mail app that sparks joy
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
MESH

Censorship-resisting overlay network for digital forensics
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
MeshCore Signal Tester

Real-time mesh signal monitor for MeshCore companion radios & repeaters
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Meshenger

Voice- and video phone App for off-the-grid scenarios.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
MeshNavarra Utility

Administer Meshtastic nodes and NavaTastic repeaters over USB and Bluetooth
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Meshtastic

The official app for Meshtastic, an open-source, off-grid, mesh radio.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
Message487

Forward notifications and SMS to n8n or your own webhook
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Messages

Simple, private SMS messaging. Offline-first, no ads, no tracking.
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Messages

A fast messaging app designed to make conversations simple and effortless
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Metadata Remover

Protect your privacy by removing metadata from your photos!
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
MetaGer: Search & Browser

Anonymous search and tab groups, private browsing with tracker and ad blocking.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
MetaPurge

Locally strip sensitive EXIF/metadata from your photos.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Meteo Weather Greece

A lightweight, beautiful weather app that fetches data from meteo.gr
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
MeteoCompare

Compare 19 weather models, 4 forecast engines and coastal conditions.
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Meteocool - Rain radar

Free & Open High-Accuracy Local Weather Radar and Forecasting
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
meteroid

Client for Mete
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Metiq: noise & ambient sounds

Colored noise, binaural beats & ambient sounds for sleep, study and focus.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Metric Time

Shows the current metric time in a widget on the home screen
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Metro - A music player for Android

Best material design music player for Android
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Metrodroid

Metrodroid can read information from some public transport NFC smartcards
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid IzzyOnDroid GitHub Zapstore
MetroMusic

A music player in the Windows Phone 8 idiom, for the music on your phone.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Metronome

A simple and elegant metronome
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Metronome

A simple metronome app which helps you keep time when practicing music.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Metronome

Metronome app for playing repeated rhythms at different speeds.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
MetroVault

Air-gapped Bitcoin signer for offline cold storage. QR-only, no network.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
MFC Balance

Generic Reader for Balance on MIFARE Classic NFC Cards
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
M
MGit

View and interact with git repositories
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid
MHGU Database

An extensive, all in one, Monster Hunter Generations reference
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub
MHWorld Database

Gathering Hall Studios is back with an all-new app for Monster Hunter World!
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Micro REPL

MicroPython IDE
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
Micro Timer

A tiny, microwave-inspired timer app for Android
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
microMathematics Plus

Computer algebra system
- System & tools
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid GitHub Zapstore
M
Microphone

Feeds audio from the mic right out of the speaker
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
MicroPinner

Test and customize the statusbar
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
Midandpad

An Android MIDI controller.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Middor

Mirror applications for HUD display with horizontal flip.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
MIDICtrl

Simple MIDI Controller for Android.
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
midistrum

Use android's native midi system as an omnichord/auto harp-like strum instrument
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore