Also see https://workadventu.re/ https://workadventu.re/ . Already seen it working well for 1000+ visitors congress meeting hub. Plus it has some well matured

Also see https://workadventu.re/ https://workadventu.re/ . Already seen it working well for 1000+ visitors congress meeting hub. Plus it has some well matured Web 1.0 capabilities: Everyone can host space by a simple file server and link with other existing spaces. As the rooms / spaces do not need to be hosted on the same server the application is served by.