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Are there any free/open source alternatives to Microsoft Teams with text/voice channels, group video calls + screen sharing, file sharing features etc.? But it should be able to be deployed on an independent server on your own machine or cloud.

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You could go with Nextcloud, which you can deploy onto your own servers.

  • file sharing: provided out-of-the-box. You can share to other members of your own instance, to Email-addresses or even anonymously, including password protection if needed.
  • ext/voice channels, group video calls + screen sharing are provided by the **Nextcloud Talk app.

Nextcloud is open source and comes fee of charge. Like Nextcloud Talk, there are many more apps to extend the functionality. On a side note: the German government decided for Nextcloud for their Bundescloud, which strongly speaks for its maturity.


Nextcloud (source: Wikipedia) and Nextcloud Talk (source: Nextcloud); click images for larger variants

What you didn't ask for: there are also several apps for mobile devices, to keep data synchronized with your Nextcloud or have a "native app" for e.g. Talk – though you could use all of it simply via your web browser.

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