Open-source team collaboration platform deployable on-premise or cloud. Designed as secure alternative to proprietary messaging tools with focus on data ownership.
| Pricing from | Free (open-source); $10/user/month (Mattermost Cloud) |
| Best for | Enterprises requiring data sovereignty, government agencies, security-focused organisations |
| Website | mattermost.com |
Strengths and trade-offs
- Full source code transparency and self-hosting option
- HIPAA, FedRAMP, and SOC 2 compliance certifications
- Smaller user base means fewer third-party integrations
- Self-hosting requires dedicated IT resources
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