Open Source Team Chat & Messaging Tools Projects

Open source AI-powered omnichannel customer service platform that combines live chat, ticketing, and team collaboration as an alternative to Slack, Zendesk, Intercom, and HubSpot.

Open source, local-first Slack and Notion alternative that puts you in control of your data with offline support and end-to-end encryption.

Decentralized private messenger using email infrastructure for secure, end-to-end encrypted communication.

A platform for community discussion. Free, open, simple.

Open-source Matrix client for secure, decentralized messaging, voice, and video — runs on your own server.

All-in-one open source platform that combines project management, CRM, chat, HR, and wiki as an alternative to Linear, Jira, Slack, and Notion.

Lightweight, Google-searchable open source Slack and Discord alternative designed for online communities.

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

Low-latency, open-source voice chat built for gaming — self-host your own server with no subscription required.

Private, peer-to-peer Slack and Discord alternative built on Tor and IPFS that needs no servers and no accounts.

Simple, open source team messaging platform

The communications platform that puts data protection first.

Instant messaging platform with self-hosted backend in Go and clients for iOS, Android, web, and command line.

Open-source team chat with a unique topic-based threading model that makes it easy to follow multiple conversations.