OK, so Darwin is a fully open-source project. The OSX site info .pdf says it merges the FreeBSD & Mach3.0 kernels, just to be confusing. :-) So OSX is both a Mach _and_ a BSD. - Ya gotta love the FOSS way! Rik Tindall wrote: > The detail I have elicited so far leads me > to believe that the MacMach kernel is still actually open-source, but I > am unsure (and instincts tell me no).