OpenSourceProjects

Open Source Mattermost Alternatives

Discover 9 open source alternatives to Mattermost. All free, community-driven, and actively maintained.

What is Mattermost?

Open-source team collaboration platform offering messaging, file sharing, and integrations as a Slack alternative.

Visit Mattermost

awesome-selfhosted

awesome-selfhosted

A list of Free Software network services and web applications which can be hosted on your own servers

humhub

humhub

HumHub is an Open Source Enterprise Social Network. Easy to install, intuitive to use and extendable with countless freely available modules.

Enterprise Social Network

thelounge

thelounge

💬 ‎ Modern, responsive, cross-platform, self-hosted web IRC client

synapse

synapse

Synapse: Matrix homeserver written in Python/Twisted + Rust

tailchat

tailchat

Next generation noIM application in your own workspace, not only another Slack/Discord/Rocket.chat

Instant Messaging

movim

movim

Movim - Decentralized social platform

RetroShare

RetroShare

RetroShare is a Free and Open Source cross-platform, Friend-2-Friend and secure decentralised communication platform.

tuwunel

tuwunel

Official successor to conduwuit

MongooseIM

MongooseIM

MongooseIM is Erlang Solutions' robust, scalable and efficient XMPP server, aimed at large installations. Specifically designed for enterprise purposes, it is fault-tolerant and can utilise the resources of multiple clustered machines.