"(...) Being a developer preview, functionality is limited. Most obvious is the lack of networking and user accounts, both of which appear to rely heavily on closed source portions of OS X. However, given the mess that the Darwin code was in as released by Apple — many individual projects would simply not compile, and many of those which did were beset by dependency problems to the point where they were unusable — it is hard to overstate what an amazing job the team has done getting to this stage. The Darwin kernel now boots and launches an X session — the choice of the NeXT-like WindowMaker window manager is a nice touch, although apparently won’t be the future default — from where the few bundled X applications can be run. It’s still early days yet, but there’s every reason to feel enthusiastic about the future of the PureDarwin project."