Interesting, worth also pointing out the SIMH project which can emulate the VAX, MicroMAX, PDPs etc and many others:

https://github.com/simh/simh

For the VMS-nostalgic, VSI now have OpenVMS running on x64 Intel (and in fact apparently already released it as 9.0!):

https://vmssoftware.com/updates/state-of-the-port/