The late Harry Reed and Charles Anthony reached a major milestone on the Multics simulator on Saturday 08 November, 2014. Their SIMH-based simulator booted Multics MR 12.5, came to operator command level, entered admin mode, created a small PL/I program, compiled and executed it, and shut down. Release 3.0.1 of the simulator is now available. There have been multiple updates to Multics for the simulator: the latest version is MR 12.8, August 2023. Anyone can try out a simulated Multics or install the simulator on their own computer.
https://www.multicians.org/multics.html