Nux
Over the last few years, I have been working on a UI technology for real-time 3D graphics applications. That technology is called Nux and it is now used by Canonical to power the next version of the Ubuntu desktop: Unity. Nux has been made open source, under the LGPL version 3.0 license.
Although, the goal of Nux is still to provide user interface technologies for graphics applications, it is also being re-factored to support the Unity desktop. Myself and a team of software engineers and designers at Canonical, are hard at work to deliver a wonderful desktop experience to Ubuntu users. Nux is one part of Unity that I am happy to contribute to this effort.