well, there is not a mac version of litestep, I can tell you that right now. re-writing the linux core to run on a mac would be one thing (difficult and time consuming, I'm sure), but re-writing all the dozens (if not hundreds) of modules to also run on mac's would be entirely different, and close to impossible (just because of the time and man-power needed for such a project).

for a linux emulator that runs on mac, I don't know, sorry.