I just found the BlueOnyx (Blue Onyx) project today. It looks like it’s meant to be a more up-to-date version of the BlueQuartz project, which is the ongoing development of the old Cobalt RaQ software. The project seems to be hardly-known right now.

There’s also Aventurin{e}, a Linux OS with a web GUI for virtualization, apparently based on the RaQ style interface, and intended to host BlueOnyx/BlueQuartz VMs. It turns out that my novel idea, hosting BlueQuartz virtual machines, is something that a lot of people have been doing for quite a while now.