OpenBSD Fork Bitrig Announced
With the goal of bringing more experimental development to the OpenBSD
code base, a few developers have announced a fork named
Bitrig. According to their FAQ, Bitrig aims to build a small system
targeting only modern hardware and "be a very commercially friendly code base by using non-viral licenses where possible." Their first step toward that goal was removing GCC in favor of LLVM/Clang. The project roadmap shows their future goals as adding FUSE support, improving multiprocessing, porting the system to ARM, and replacing the GNU C++ library with LLVM's.
In the sense that it runs twice as many servers as Windows, roughly the same about of desktops as Macs (according to Steve Ballmer), and more mobile devices than any other OS in existence (where, btw, it is outpacing its rivals by a wide margin and now selling more units than desktop devices per year as nearly a million new linux-based (yes, Android is based on linux) mobile devices are activated every day. That sounds pretty successful. And it doesn't even include the embedded market, which you clearly know nothing about. So many embedded devices in use in many industries (the cable industry for instance) run Red Hat Linux and other distros.
As of June 2010 the operating systems used on the world's top 500 supercomputers were: Linux 91.0%, Unix 4.4%, Hybrid Unix/Linux 3.4%, Windows HPC 1.0%, BSD 0.2%
That metric works for me. You apparently prefer ones with pretty pointy-clicky thingies.