Does the software support 8bit CPU architecture?

Does this software simulate various CPU architectures like the zilog z80 or the Intel 8080 etc?

If not, this would be a nice addition to see in the future.

Depends what you by simulate, as the Z80 part just posted indicates it will certainly (as long as someone makes the parts) support 8 bit CPUs (or any other chip pretty much). If you mean run software to compile for it, not at this point and probably not in the future as that isn’t the core purpose of the software. The current code tab can’t currently load software for the Arduino as far as I know.