46kActiveWindows · Mac · Linux · Android · iPhone · In your browserMITOpen coreRuns on your own server
Rocket.Chat is a team messaging platform for real-time chat, voice calls and federation between organizations. It is aimed at workplaces and organizations that want to host their own chat with strong data protection.
39kActiveWindows · Mac · Linux · Android · iPhone · In your browserAGPL-3.0Runs on your own server
Mattermost is a team chat platform that you install on your own server, so your company's messages stay under its control. It is aimed at workplaces and IT teams that want chat, workflow automation and voice calls in one place.
26kActiveWindows · Mac · Linux · Android · iPhone · In your browserApache-2.0Runs on your own server
Zulip is a team chat app where conversations are organized by topic, so it combines features of email and chat. It is for workplaces and open-source projects, and can be used on the web or self-hosted on your own server.
14kActiveWindows · Mac · Linux · Android · iPhone · In your browserVerifiedAGPL-3.0App
Element is a chat app for private messages and group chats over the Matrix network, used in a web browser or as a desktop app. It is for people and teams who want chat they can host and control, with phone apps offered as separate Element X projects.
App · GitHub · Chat network (Matrix); some set-up needed
None of these match. Try another device.
Before you build
Planning something for an alternative to Slack? See what exists first, so you can reuse parts or explain what's different. Paste this into any AI assistant:
Read the list of open-source alternatives at https://opensourceeverything.org/data/groups/team-chat.json. Compare it with my project or idea below. Tell me which projects overlap, what I could reuse instead of rewriting, and what mine does that none of them do.
My project or idea:
Here is a list of open-source alternatives to Slack, from Open Source Everything (CC BY-SA 4.0):
- Rocket.Chat (MIT, https://github.com/RocketChat/Rocket.Chat; replaces fully): Rocket.Chat is a team messaging platform for real-time chat, voice calls and federation between organizations. It is aimed at workplaces and organizations that want to host their own chat with strong data protection.
- Mattermost (AGPL-3.0, https://github.com/mattermost/mattermost; replaces fully): Mattermost is a team chat platform that you install on your own server, so your company's messages stay under its control. It is aimed at workplaces and IT teams that want chat, workflow automation and voice calls in one place.
- Zulip (Apache-2.0, https://github.com/zulip/zulip; replaces fully): Zulip is a team chat app where conversations are organized by topic, so it combines features of email and chat. It is for workplaces and open-source projects, and can be used on the web or self-hosted on your own server.
- Element (AGPL-3.0, https://github.com/element-hq/element-web; replaces fully): Element is a chat app for private messages and group chats over the Matrix network, used in a web browser or as a desktop app. It is for people and teams who want chat they can host and control, with phone apps offered as separate Element X projects.
Compare it with my project or idea below. Tell me which projects overlap, what I could reuse instead of rewriting, and what mine does that none of them do.
My project or idea:
