It’s probably worth mentioning that you can also use QEMU, which is a bit more involved but can use a bigger disk and also run OS X, and Mac OS 9.2.2 (as it supports an MMU, SheepShaver doesn’t)
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.
I had a a project for #marchintosh of making myself a nice powerPC emulation stack to recompile and open source quite a few free/shareware I did back then, but I more or less gave up as I couldn't find something 'comfortable' to work in. I guess I'll have to find, dust up and try to hook that old G4 Mac Mini that I'm sure is in a drawer, somewhere :-)