ZopeCrossPlatformness
the ZOPE Application Server can run on any platform that has a python interpreter, and a c compiler. here is list of platforms ZOPE has been known to work with (out of the box):
Windows 2000, Windows NT, Windows 98, Linux, Free BSD, Tru64, HP-UX, Solaris, OpenBSD, NetBSD?, MacOS, OpenVMS, BeOS?. I believe IBM's AIX takes some tweaking to get to work, but its not very difficult.