Open Source Apps i Like or Plan To Test

Experience Mumble servers on your Android device to the fullest with Plumble- Android's premier client. With voice activity and push-to-talk input, communicate with your friends on any Mumble 1.2+ server. Paid app in .

Free calls using open technology on Android. A heavily enhanced derivative of SIPdroid, adding support for ZRTP, SRTP, ENUM, ICE/TURN

0xchat is a secure chat app built on the Nostr protocol. It prioritizes security, featuring private key login, encrypted private chats and contacts, encrypted group chats.

AzadiConnect is a cross-platform application designed for secure, anonymous peer-to-peer communication in restricted network environments. It allows users to chat and transfer files without relying on central servers.

A user-friendly messenger for everyone with a focus on privacy and freedom.

an open-source, privacy-first social platform providing a safe digital home and voice for unrepresented nations & communities.

A extensively modified and feature-rich fork of Reticulum MeshChat by Liam Cottle.

• Senders send messages stamped with Bitcoin ecash to Nostr relays. The Nostr relays collect the Bitcoin ecash, then deliver messages to receivers.

The most secure and anonymous messenger, encrypted with Blockchain.

White Noise aims to be the most secure private chat app on Nostr, with a focus on privacy and security. Under the hood, it uses the Messaging Layer Security (MLS) protocol to manage group communications in a highly secure way.

A peer to peer private anonymous and secure messenger that works over Tor.

Free, open-source conferencing with end-to-end encryption, group chat, screen sharing, Etherpad integration, customizable setup, and privacy by default.

A true P2P phone application for voice and video calls. No Internet access needed, no registration, not advertisment or calling back "home". Scan each others QR-Code and call each other. This works in over local networks such as community and company networks or at...

A modern, powerful and feature-rich media management app for Android featuring a swipe-to-sort interface and advanced duplicate/similar media detection.

OSHI is a free, open-source, end-to-end encrypted messenger for iOS and Android that uses Bluetooth and Wi-Fi mesh networking to send messages without Internet or cellular service. OSHI does not require a phone number, email address, or account.

Open Source Android XMPP Client.

aTox is a free open-source messaging app for the Tox protocol.

Vector encompasses the ideals of freedom through free and open-source technology, using a "Privacy by Principle" approach. This means that privacy is not a feature or add-on, but the core foundation that Vector is built upon, which is granted and accessible to everyone.

Converse is a messaging app for decentralized, secure, end-to-end encrypted conversations. Built on the XMTP network, Converse lets you own your conversations and take them anywhere whenever you want, ensuring your most important messages—the ones you never want to lose or be...

EchoId is a privacy-focused messaging platform designed for secure and real-time communication. It combines encrypted messaging, voice/video calling, and a lightweight architecture to deliver a fast and reliable chat experience.

Dirc is a peer-to-peer web application which uses WebRTC to set up connections between chat participants without requiring a back-end server. The static files can be self-hosted. Other features:

Instant messaging with text, voice, video calling, screen sharing, privacy controls, customizable permissions, moderation, bots, and open-source design.

This is a bare-bones Android Studio project implementing baresip based SIP User Agent. Its development is motivated by need for a secure, privacy focused SIP user agent for Android that does not depend on third party push notification services.

Zerion is a secure messaging app and encrypted vault designed for people who need private, anonymous, censorship-resistant communication.

Mumla is an open source Mumble voice chat client for Android 4.0+

Peach is a local-first, zero-knowledge password manager for Chrome, Firefox and Android. Your vault never leaves your device — there's no server, no cloud, and nothing to breach.

Decentralized messaging client for Android, Linux and macOS allowing you to communicate with people or LXMF-compatible systems over Reticulum networks using LoRa, Packet Radio, WiFi, I2P, or any other medium Reticulum supports.

Smoke Messenger is an open-source Instant Messenger that is known as the first mobile Messenger worlwide using the encryption algorithm McEliece. To be downloaded at F-Droid.org or Github.com. Smoke provides with its own Server-Software: SmokeStack-Echo-Server.

SonoBus is an easy to use application for streaming high-quality, low-latency peer-to-peer audio between devices over the internet or a local network.

VeilidChat is a 1-to-1, person-to-person text only chat application which serves as a technology demonstration for the Veilid application development framework. All communication is end to end encrypted, authenticated, private routed, and peer-to-peer. It's currently in early beta.

Private social media. Embed a self-hosted Discord alternative under your site.

Peer-to-peer group chat platform syncing messages over Tor and IPFS, ensuring private, encrypted, decentralized collaboration without any central servers.