Tribblix is an operating system derived from OpenSolaris, OpenIndiana, and Illumos, with a retro style and modern components.
NEWS: March 18th 2014: Milestone 9 released, with gcc4 as the standard compiler instead of gcc3, and the usual updates. See changes.
At the present time, it's proved that the concept can work, but certainly isn't fully functional, complete, or suitable for production use. But you can download a live image, install to a hard drive, and use it.