BBCWatcher writes: When Sun released Solaris to the open source community in the form of OpenSolaris, would anyone have guessed that it would soon wind up running on IBM System z mainframes? Amazingly, that milestone has now been achieved. Sine Nomine Associates is making its first release of OpenSolaris for System z available for free and public download. Source code is also available. OpenSolaris for System z requires a System z9 or z10 mainframe and z/VM, the hypervisor that's nearly universal to mainframe Linux installations. (The free, limited term z/VM Evaluation Edition is available for z10 machines.) Like Linux, OpenSolaris will run on reduced price IFL processors. For the record, Linux moved to the mainframe almost nine years before OpenSolaris.