Garr, a nodeshell :D
Photon MicroGUI is the interface for the QNX operating system. Made famous by it's use on the QNX 1.44 meg operating system demo, where an entire OS including web browser and a few simple apps (notepad, etc) were fit on one disk with the capability to expand more apps out into a ramdisk via the internet.
Available also in the QNX RTP, the real-time platform version of QNX which you can download from www.qnx.com .
It looks quite elegant, with full anti-aliased fonts support and smooth mouse movement. The interface is like Windows's on the bottom, with a start bar, but improves upon this with a shelf along the right side where commonly launched proggies can go, as well as applets like a CPU meter and volume control.