Mattermost
An open-source enterprise instant messaging and collaboration platform that supports self-hosted deployment. It provides channel-based messaging, file sharing, and integrations, serving as an open-source, self-hostable alternative to Slack.
Timeline (last 90 days)
Antimatter is a fork based on Mattermost's open-source code, aiming to provide self-hosted open-source chat software without paywalls or promotional pop-ups.
Mattermost adopts a dual-licensing model: the server core code uses AGPL, some client code uses Apache 2.0, and enterprise edition features are released separately in closed-source form.
LDAP, SAML, and OIDC authentication features are paid enterprise-edition-exclusive features in Mattermost.
The Antimatter author describes it as a drop-in replacement for Mattermost, and existing users can theoretically migrate smoothly.
The author is dissatisfied with Mattermost's commercial strategy, including placing previously free features behind paywalls, imposing artificial limits on unlimited features, and adding nag screens urging users to purchase licenses.
fluado's migration plan was to move off Google Cloud, GitHub, Supabase Cloud, Firebase, Cloudflare, and Slack, replacing them with Hetzner, Forgejo, self-hosted Supabase, Scaleway, and Mattermost.
All Facts (6)
Antimatter is a fork based on Mattermost's open-source code, aiming to provide self-hosted open-source chat software without paywalls or promotional pop-ups.
50%UnverifiedMattermost adopts a dual-licensing model: the server core code uses AGPL, some client code uses Apache 2.0, and enterprise edition features are released separately in closed-source form.
50%UnverifiedLDAP, SAML, and OIDC authentication features are paid enterprise-edition-exclusive features in Mattermost.
50%UnverifiedThe Antimatter author describes it as a drop-in replacement for Mattermost, and existing users can theoretically migrate smoothly.
50%UnverifiedThe author is dissatisfied with Mattermost's commercial strategy, including placing previously free features behind paywalls, imposing artificial limits on unlimited features, and adding nag screens urging users to purchase licenses.
50%Unverifiedfluado's migration plan was to move off Google Cloud, GitHub, Supabase Cloud, Firebase, Cloudflare, and Slack, replacing them with Hetzner, Forgejo, self-hosted Supabase, Scaleway, and Mattermost.
50%