And not all GNU is Linux! Beyond the world famous GNU Hurd, there’s also Debian GNU/kFreeBSD, and Nexenta (GNU/Illumos, which is the OpenSolaris kernel).

I think the most esoteric of them, though, is GNU Darwin (GNU/XNU). Darwin is the open source parts of OS X, including its kernel, XNU. There used to be an OpenDarwin project to try to turn Darwin into an actual independent operating system, but they failed, and were superseded by PureDarwin, which took a harder line against anything OS X getting into the system. GNU Darwin took it one step further and removed just about all of Darwin (except XNU) and replaced it with GNU instead.

• Chimera (alpha stage): Chimera uses a novel combination of core tools from FreeBSD, the LLVM toolchain, and the Musl C library

Who was the incredible smart person to name a new distro with a similar name to another, older, Linus distro? ChimeraOS