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Look at the open source office tools from faircom... Scroll down a little https://www.fairkom.eu/en/fairapps

Thanks, I don't understand how to start a video call session, but I'll calmly get there :)

It's basically a free jitsu instance to use and test https://www.fairkom.eu/en/fairmeeting

Thanks, I have already tried Jitsi, but as I said, the file transfer and the whiteboard are missing, MiroTalk seems the most complete for now.