alt.os.development - join
Low activity, 909 subscribers, Usenet

comp.os.plan9 - join
Plan 9 from Bell Labs. (Moderated)
Low activity, 433 subscribers, Usenet

linux.kernel - join
linux-kernel@vger.kernel.org (Moderated)
Low activity, 4342 subscribers, Usenet

nlo.lists.kernelnewbies - join
Discussion list for beginning (Linux) kernel programmers (Moderated)
Low activity, 559 subscribers, Usenet

comp.os.linux.development.system - join
Linux kernels, device drivers, modules.
Low activity, 2489 subscribers, Usenet

comp.os.research - join
Operating systems and related areas. (Moderated)
Low activity, 495 subscribers, Usenet

Minix-CN - join
Minix Group for Chinese enthusiasts
Low activity, 25 members, restricted

comp.os.mach - join
The MACH OS from CMU & other places.
Low activity, 35 subscribers, Usenet

comp.lang.c - join
Discussion about C.
Low activity, 13885 subscribers, Usenet

comp.lang.asm.x86 - join
Bulletin Board and Q&A for x86 assembly language topics. (Moderated)
Low activity, 1573 subscribers, Usenet