Beardydog writes "SkyOS, the commercial, alternative OS created almost entirely by Robert Szeleney, became free (as in beer) sometime last month. Alternative OS enthusiasts can be forgiven for missing it, as the website has been largely derelict, and the forums overrun with spam, since the project was halted in 2009. It's not clear from the announcement whether the ISO available is the traditional build, or the version rebuilt around Linux. The post announcing the free version provides a license name ('public') and registration code that must be entered during setup. While it isn't quite the open-sourcing that most followers hoped for, it's heartening to know SkyOS won't be completely lost in the mists of time."
For a blast from the past, check out our old stories about SkyOS