FOSS apps: free and open source

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

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Boost Me Buddy

Boost Podcasting 2.0 shows over Lightning, with Nostr.
- Multimedia
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Boris

Nostr-native offline reader with highlights and other stuff
- Education
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Bouquet

Nostr static-website gateway for Android
- Internet
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Bro

Pay bills with Bitcoin. No banks. No KYC.
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Btc Blake2b Wallet

Self-custodial Bitcoin wallet for the blake2b network with Lightning support
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
BTC Steuertool

Bitcoin tax reports for Germany (FiFo, § 23 EStG) — fully offline, no internet permission, no account.
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
BTClock

Live Bitcoin metrics on your home screen, in BTClock style.
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
BuhoGO

The friendly Bitcoin and Lightning wallet
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore Google Play Aurora Store GitHub
Buzzster

Your perfect social space
- Communication
- FOSS
- Free
- Android only
Zapstore GitHub
Buzzster Warp

The uncensored VPN
- Android only
Zapstore Google Play Aurora Store GitHub
Bíblia Sagrada

This project was generated with Angular CLI version 18.0.3.
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
C
CacheRelay

A multi-platform cache relay
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
Calcifer

AI-powered calorie tracker
- System & tools
- FOSS
- Free
- Paid
- Android only
Zapstore Google Play
Calculazor

A sexy calculator that doesn't just forget everything.
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
Calendar by Form*

A private, decentralized calendar powered by Nostr. Your schedule, your keys.
- Calendar
- FOSS
- Free
- Paid
- Nostr
- Android only
Zapstore Google Play GitHub
camelus

Decentralized microblogging arrived 👋
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore Google Play Aurora Store
CanopyUI

A debugging app for the Canopy relay software. Eventually this will switch to a more user friendly UI for managing and interacting with the…
- System & tools
- FOSS
- Free
- Android only
Zapstore
Card Installer

Provision and wipe NTAG424 Boltcards for LaWallet
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Cashu

Cashu Wallet is a native wallet for Cashu ecash, Lightning, on-chain Bitcoin, Nostr payment requests, and NFC contactless payments.
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore Google Play Aurora Store GitHub
Cellibacy

Automatically share your daily data usage on Nostr.
- System & tools
- FOSS
- Free
- Nostr
- Android only
Zapstore
Chama

Trade Bitcoin and local money with people in your community.
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
ChuChu

ChuChu is a decentralized content subscription platform based on the Nostr protocol, with a built-in custodial Lightning wallet, supporting…
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore
CipherKeys

PGP-encrypting Android keyboard
- System & tools
- FOSS
- Free
- Android only
Zapstore
Clean & Set

A recurring task management app for planning and keeping up with the routines of life.
- Productivity
- FOSS
- Free
- Android only
Zapstore
CodeDeck Next

Control Claude Code sessions on your laptop from your phone over encrypted Nostr.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
coinos v3

Self-custodial bitcoin wallet with instant Ark payments, on-chain savings and nostr chat
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore
coinos-ui

Coinos web app front-end code
- Finance
- FOSS
- Free
- Android only
Zapstore
Coop

Chat and Co-op Privately
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore
Coracle

An experimental Nostr client focused on unlocking the full potential of multiple relays.
- System & tools
- FOSS
- Free
- Nostr
- Android only
Zapstore
Cordn

Private group messaging you can own. Open-source Cordn client with MLS end-to-end encryption and Nostr-based identity.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Cordn Coordinator

Run your own Cordn coordinator from your pocket — MLS key packages, welcomes, and group message delivery as an Android app.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Criptocracia

Experimental, trustless open-source electronic voting mobile app.
- Android only
Zapstore GitHub
CruxCoach

Open-source climbing-board app for Kilter, MoonBoard and more
- Health & fitness
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
CustID

Your truly sovereign identities in your pocket, secured.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore
Damas Clash

Play checkers online against real players in fast and competitive matches.
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
Dana

A mobile wallet for accepting bitcoin donations
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
Dark Wisp

The Client that Just Works
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Deepmarks

Nostr-native social bookmarks and long-tail archives.
- Productivity
- FOSS
- Free
- Nostr
- Android only
Zapstore Google Play Aurora Store
DeSent Email

Private email. No ads. No bs. Today. Tomorrow. Always.
- Calendar
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Digital Mindfulness

Local-first Android tracker for distracting site sessions and active time.
- Productivity
- FOSS
- Free
- Android only
Zapstore GitHub
Dispatch

Trips out. Notes back. Encrypted always. Dispatch is a local-first travel organizer: your data lives in a database on your phone, fully…
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Ditto

Your content. Your vibe. Your rules.
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore Google Play Aurora Store
Divine

Divine is a new 6-second looping video app, inspired by Vine, with a
- Communication
- FOSS
- Free
- In-app purchases
- Nostr
- Android only
Zapstore Google Play Aurora Store GitHub
DonkeyRide Driver

Direct rider and driver coordination over Nostr, without platform commission
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Drive by Form*(Experimental)

\[Experimental\] A private, end to end encrypted drive powered by Nostr. Your files, your keys.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Drivestr

Rideshare, without the middleman.
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Earthly

Collaborative maps built on Nostr
- Navigation
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Ecash App

A free and open source Fedimint wallet
- Finance
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store GitHub