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FlockMattermost
Freemium

Sign-up is self-serve; check the site for current plans.

 Freemium

The desktop client is free and open source. The Mattermost server has a free self-hosted…

Web Windows, macOS, Linux
  • Channels for organising team discussion
  • Built-in voice and video calls with screen sharing
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • Proprietary hosted service; data lives on the vendor's servers
  • Aimed at organisations rather than personal use
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
Downloadable app, Web application, Hosted service Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Account needed Account needed
Needs internet Needs internet

Checked September 24, 2026

Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.