Mattermost
Open-source, self-hosted team messaging for secure environments.
About Mattermost
In Mattermost’s own words: “Zero-trust collaboration, automation and AI in private cloud, self-hosted, and air-gapped environments. Built for national security, critical infrastructure, and regulated enterprises.”
Mattermost is open source and can be self-hosted.
People switching from Slack, Discord and Microsoft Teams often consider Mattermost.
Mattermost is an alternative to
Similar to Mattermost
- ElementSecure, decentralised messaging on the Matrix protocol.
- Rocket.ChatOpen-source team chat with full data control.
- ZulipOpen-source chat organised by topic-based threads.
- DiscordFree voice, video and text — popular for communities and small teams.
- Google ChatMessaging built into Google Workspace.
- SlackTeam messaging with channels, threads, huddles and thousands of integrations.
- Microsoft TeamsChat, meetings and files, included with Microsoft 365.
- MumbleFree, open-source, low-latency voice chat you can host yourself.
Listed for information; LaunchStall isn’t affiliated with Mattermost. The quoted description comes from mattermost.com. Features and plans change — check the official site for current details.