The Gnome window manager PBI can be downloaded here.
Another interesting PBI is the Thin Client Server. This PBI installs dhcpd and configures PC-BSD as a Thin Client Server. Clients connected to the servers NIC, will be able to network boot via DHCPD & PXE, and then be brought to a KDM login screen. For more details about this PBI, please read through our Thin Client Wiki