Mattermost
Mattermost Free
Mattermost Free is the open-source Community Edition — self-hosted, unlimited users, and channels.
Team Messaging
Plan Features & Specifications
| Price | Free (self-hosted) |
| Users | Unlimited |
| Channels | Unlimited |
| Message History | 10,000 recent messages |
| Integrations | 5 integrations |
| File Sharing | Yes — 10 GB storage |
| SSO | No (paid) |
| Compliance | Basic |
| Self-Hosted | Yes |
| Platforms | Web, Windows, macOS, Linux, iOS, Android |