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Tribblix is an operating system created by Peter Tribble. Derived from OpenSolaris, OpenIndiana, and illumos, it blends a retro style with modern components.

NEWS: June 7th 2017: Milestone 20 released, with many updates. This updated release initially available for x86. (Release Notes.)

Update: May 29th 2017: Milestone 18 upgrade (not ISO) available for SPARC. (Release Notes.)

While the SPARC version is still pretty experimental, the x86 version is pretty solid. You can download the image, install to a hard drive, and use it.