[sharikous]

That's the option with the least headache. I believe there are other simulators too but they are much more specialized.

With some hacking you can run all MacOS/MacOS X versions on x86, x64 and PPC from 8.6 to 13 if you have a x64 machine. If you have an Apple Silicon one it gets too slow to simulate around 10.10 (on x64 you can use hvf virtualization). It might be a bit less nice than tailored emulators like SheepShaver but having the same UI for all these OSes (plus other OSes) beats everything in my opinion.

Unfortunately Apple Silicon machines cannot be simulated without some hidden knowledge only some secretive companies have. Hopefully the knowledge will become public some years from now.