EQEmu can be used on Mac OSX and above... As it uses FreeBSD as its backbone OS... And because it IS using FreeBSD (unix basically) the Linux emu can be used.. This is all to say it CAN be done... Now how easy is a different matter... You would definately have to enable Linux Binaries (meaning that most things that are Linux specific, can be run on a FreeBSD machine)... check out this page and do some searching around for more information about it...
http://www.freebsd.org