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Team Chat & Self-hosted Messaging

Open-source and self-hostable team messaging.

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Rocket.Chat

Messaging, voice, video, apps, and AI that connect you with allies and partners on any system. Deployed anywhere, entirely under your control.

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Mattermost

Zero-trust collaboration, automation and AI in private cloud, self-hosted, and air-gapped environments. Built for national security, critical infrastructure, and regulated enterprises.

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Zulip

Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

FreeNo auth

Matrix Synapse

Synapse: Matrix homeserver written in Python/Twisted.

FreeNo auth

Element (formerly Riot)

A glossy Matrix collaboration client for the web.

FreeNo auth

Rocket.Chat Mobile

The Secure CommsOS™ for mission-critical operations

FreeNo auth

Wire

Collaborate without compromise with Wire, the trusted platform for millions worldwide.

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Keybase Chat

chat is now on Keybase, an open source app for encryption and cryptography.

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Threema Work

Threema Work is the privacy-first communication solution for secure business messaging, confidentiality, compliance, and data protection.

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Tox (decentralized chat)

Whether it's corporations or governments, there's just too much digital spying going on today.

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Rocket.Chat Apps Engine

The Rocket.Chat Apps engine and definitions.

FreeNo auth

Mattermost Plugin API

A hackathon project to explore reworking the Mattermost Plugin API.

FreeNo auth

Glip by RingCentral

AI-powered messaging for seamless collaboration for every team. Chat, video, file sharing, and task management in one platform. Try it for free.

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Mumble (voice chat)

Mumble is a free, open source, low latency, high quality voice chat application.

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Mattermost API

REST API v4 — first-class per-endpoint pages generated from the canonical OpenAPI specification.

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