Earlier quoted context omitted.
I've tried to get an Alpha Emulator working on OS X so I can try OpenGenera, but there really isn't anything that really works out there except for one paid piece of software. I believe the freeware emulator was the origin of the paid one and the freeware one is no longer maintained AFAICT.
Genera itself is commercial software, if you have a licence to use it then you may as well just compile the emulator for OS X, I can't see any reason to have an emulated Alpha layer as well. Someone could try compiling either the MIT or TI Explorer emulators to js I guess.
Furthermore, there is a lot of value in having something out there that brings more attention to LISP machines and the novel ideas they introduced. Right now the barrier to trying OpenGenera out is remarkably high. Even googling for Genera or OpenGenera doesn't show a product page among the top results and the symbolics website is a glorified advertisement page.