There are a bunch of contributors to these projects. I wrote the C version of Orca (and helped design the second version of its evaluation strategy) but also had help and ideas from other contributors as well. I wrote the Windows version of Uxn, Uxn32, which was a from-scratch implementation, except for a couple of things like the palette mixing table. The code from Uxn32's VM core ended up in other versions of Uxn emulators, which were then modified and improved by the people running those projects. There is not any governing body, committees, or authoritative leadership for these projects. We just talk to each other through various channels and do stuff. It's a collective.