Open-source Rocket.Chat MCP alternatives
The Rocket.Chat MCP server is open source, in keeping with Rocket.Chat itself. If you want that auditability from a different platform, every server here publishes its code. Reading the repo matters when an agent can post messages, manage rooms, or reach an audience on your behalf.
These are the open-source servers people weigh against Rocket.Chat. Most are chat or messaging; one moves into telephony and one into documents, and the notes say where each fits.
The 8 best open-source alternatives
Built on Telethon and fully open, the Telegram server reads chats, manages groups and contacts, and sends or modifies messages and media, a community channel with source you can read.
Set up Telegram →LINE's open-source server pushes and broadcasts text and flex messages, manages rich menus, and reads profiles, for messaging a LINE audience rather than internal team chat.
Set up LINE →Open and decentralized, the Matrix server reads rooms and messages, sends chats, and manages rooms over HTTP, the closest open match for self-hostable team chat alongside Rocket.Chat.
Set up Matrix →Mattermost's open-source server works with channels, messages, threads, reactions, users, teams, and files, the nearest team-chat match with a repo you can audit and run yourself.
Set up Mattermost →- TwilioOfficial
Driving SMS, voice, Verify, Lookup, and 1,400+ API endpoints, the open-source Twilio server is a telephony channel rather than chat, with source to inspect before it sends.
Set up Twilio → - VonageOfficial
Sending SMS, WhatsApp, RCS, and voice messages and managing numbers and applications, the open-source Vonage server is telephony for reaching phones instead of chat users.
Set up Vonage → - Discord MCPCommunity
Running a bot for messages, channels, forums, roles, and webhooks, the open-source Discord community server is the option when conversations happen on Discord.
Set up Discord MCP → An adjacent tool, not chat: Notion's server searches, reads, and writes across a workspace. It is open source but fits documents rather than messages, so reach for it only when the job is notes, not conversations.
Set up Notion →
How to choose
Among the open-source options, Mattermost and Matrix are the closest team-chat matches, both auditable and self-hostable like Rocket.Chat. Telegram and Discord cover community chat. Twilio and Vonage move to SMS and voice. Notion is the outlier, an open document workspace rather than a chat server. Read the repo before granting post or room access, whichever you choose.
FAQ
- Is the Rocket.Chat MCP server open source?
- Yes. The Rocket.Chat server is open source, matching Rocket.Chat's own model, so you can audit which calls it makes before granting access. Every alternative on this page is also open source.
- Which open-source server is closest to Rocket.Chat?
- Mattermost's open-source server is the nearest team-chat match, with channel, message, and thread tooling. Matrix is also close and, like Rocket.Chat, runs on your own homeserver. The other picks cover community chat, telephony, or documents.