The best open source Team Collaboration alternative to Google Workspace is CryptPad. If that doesn't work for you, our users have ranked more than 50 alternatives to Google Workspace, but unfortunately only two of them are open source Team Collaboration Tools. If you can't find an alternative you can try to remove all filters.
CryptPad is a private-by-design alternative to popular office tools and cloud services. All the content stored on CryptPad is encrypted before being sent, which means nobody can access your data unless you give them the keys.
Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.
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It protects your privacy. Keep your data yours! Also, it doesn't just drop products at random times...