URL should be: https://opentalk.eu/en/product (which the posted article references as a source) - which is a dupe of https://news.ycombinator.com/item?id=33551872

It doesn't appear very open.. there's no product download (some copy suggests it's hosted only), no source code (might not be that kind of open), no pricing (unless it's free as in beer?), no get started guide. There's a demo which reports it's extremely beta from last night, but other than some (very nicely written) copy there's not much to go on here.

What advantages does it have over the open source jitsi or open source bigbluebutton?