Mattermost

Team chat you can self-host when Slack seat cost or data residency outweighs ops. Prefer hosted Slack/Discord/Mattermost Cloud until collaborators and a real VPS justify the stack.

Official

mattermost.com · docs.mattermost.com

Dev-Centr docs

Explanation · Chat · Defaults by stage · Stack map

Highlights

  • Self-host on a VPS (Hetzner/DO/Vultr-class) — not shared/cPanel hosting

  • Linear via webhooks or n8n; agents via Composio + Mattermost REST/PATs

  • Offload attachments to Cloudflare R2 or Backblaze B2; CDN for hot media