The best alternative to Mattermost is Twake, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Mattermost and 18 are so hopefully you can find a suitable replacement. Other interesting alternatives to Mattermost are Movim, Mirotalk, Tracim and Grape.
Twake is a real-time teamwork platform. It is a suite of collaborative tools that includes the specificities of some bestsellers (Slack, Trello, Google Drive...). We provide professional messaging, storage space, online collaborative editors (Words, Excel, PowerPoint), task...
Decentralized social and blog platform based on XMPP, enabling self-hosting, cross-network chat, video calls, and group collaboration. Users control and migrate their data, communicate across various networks, and access services from any node while preserving privacy and open-source principles.
Powered by WebRTC, Real-time video call, chat room and screen sharing entirely browser based.
All you need in a team collaboration tool dedicated to small efficient teams. Chat, notes, drive, online collaborative edition, calendars, news, spaces, notifications...
Get more done – with Grape (also called ChatGrape). Grape is an European Business-Messenger with an On-Premise and Cloud solution. It is GDPR compliant and prioritizes data security and safety.
This simple Matrix client written in Python allows you to send and receive messages and files, verify other devices, and interact with your Matrix account or other Matrix users in many ways. You use it from the terminal (CLI) or integrate it into other simple Python programs.
PrivMX Fusion is safe and easy collaboration software for all kinds of teams, with virtual workspace protected by end-to-end encryption. Each team uses desktop/laptop client software and its own (zero-knowledge) PrivMX Team Server.
VideoMeeting is a free and open source video conference solution built to have video calls and chats using your web browser. It is a pure web application based on WebRTC that can provide communication features within your web browser.
Mycelium (formerly Disclone) is a feature-rich, open source communication app and personal-collaborative hub (drive/notes...).
Twake Chat is a secure, open source messaging platform designed for enterprises. It offers seamless integration of chat, video conferencing, file sharing, and email, and more.
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