GNU/Solaris
It’s always fun to watch somebody take an axe to two or more unrelated projects and bolt selected chunks together.
NextentaOS, a.k.a. GNU/Solaris, is an example. On the heels of Sun releasing opening up the source code of Solaris, the project took the OpenSolaris kernel and grafted the GNU user-land on top of it. Although Solaris on Intel never tickled my fancy, the Ubuntu/OpenSolaris hybrid is an intriguing combination, if for no better reason than “because it can be done"…
It’s not the first time that the GNU user-land has been ported to a kernel other than Linux, either. GNU/Mach comes to mind and I dimply recall a similar project involving one of the *BSD kernels. While it’s not a bad thing to be agnostic about the kernel and for desktop usage or most application servers any differences should be transparent, the situation is different for firewalls and VPN gateways, say. Having said that, the preceeding also suggests a fun project or two - retool these appliances for NextentaOS.