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Slack alternative you control
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Mattermost is listed in team chat & messaging because it competes on utility: slack alternative you control. It's VC-backed — we note this openly and watch the monetization path; the license and self-host route are the safeguards. Licensed MIT/enterprise; pricing: free (ce) / enterprise. Its resource footprint is reasonable for what it does, though not featherweight. This entry is provisional — the scores are seeded estimates pending our full manual rubric pass, and the verification date will appear here once complete.
CE feature-gating to verify
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