Open-source alternatives to Microsoft Teams

The open-source or self-hostable project you can use instead of Microsoft Teams, with license, free-edition limits and setup checked against official sources.

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Rocket.ChatAlternative to Slack, Microsoft Teams
A self-hostable team communications platform with chat, channels, and omnichannel customer messaging.
MITSelf-hostedCloud
46k
GitHub stars
Some features paywalled

Rocket.Chat — Rocket.Chat offers self-managed team messaging for organizations that need to keep data on their own servers.