Mac OS X 10.2 or higher

Product Description:
We are pleased to announce the immediate availability of Darwin 6.0.1, the Open Source core underlying Mac OS X v10.2 "Jaguar". The Darwin kernel features many enhancements from FreeBSD 4.4 and the KAME IPv6/IPsec code, and is one of the first Open Source operating system releases to be built using GCC 3.1. Darwin 6.0.1 features improved support for POSIX threads and adds several reentrant C library functions, as well as numerous new and updated libraries including ncurses, bzip, and SASL. Darwin now uses bash as the default /bin/sh, and adds python and ruby as scripting languages. We are updating the Darwin Tools package enabling you to build Darwin components on top of Mac OS X itself.

if anyone tries it out let me know how its going.