bsd distro ...
GNU make their own versión of NextSTEP - > GnuSTEP, that make possible run GNU tools in Darwin base systems
Minix (written from zero by Linus Torvalds with C) - > Linux kernel
GNU HURD (written from zero by Richard Stallman with C) - > HURD lost developers then thanks to Maddog initiative Stallman make the the GNU tools come to Linux
Debian has thinking on it and had a versión of each sistem, there are:
Debian GNU Linux
Debian GNU k/FreeBSD (the GNU is for doing the kernel doing things like we do in Linux)
Also you can check Hyperbola, today they're lefting Linux for OpenBSD kernel it can helps you
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