[open-source]

Thank you very much, but it seems to have a 60 minute limitation for each meeting and disabled recording, and also requires registration. It's popup this message: Due to increased demand, recordings are temporarily disabled and the maximum duration of a meeting has been reduced to 60 minutes on this server. (k8s).

[elkos]

That's for the demo site. These limitations aren't inherent to the bigbluebutton platform. If you deploy it on your own machine (It's suggested to do it on servers not VMs but for small teams it may be more than enough) without such limitations.

[open-source]

But I'm Not sure it have file sharing and collaborative whiteboard?

[codegeek]

That is the hosted demo version. You can self host with no restrictions. It is open source

https://github.com/bigbluebutton/bigbluebutton