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Mattermost

Open source team collaboration platform for secure messaging, channels, playbooks, and workflow coordination. Mattermost is often evaluated by teams t

Rocket.Chat

Open source communications platform for team chat, customer collaboration, and secure messaging. It is a practical Slack alternative for organizations

Zulip

Open source team chat built around topic-based conversations. Zulip is useful for distributed teams that need high-signal asynchronous communication a