comp.programming.threads - join
All issues about multithreaded programming.
Low activity, 2560 subscribers, Usenet

comp.os.linux.development.apps - join
Writing Linux applications, porting to Linux.
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comp.os.linux.development.system - join
Linux kernels, device drivers, modules.
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comp.protocols.tcp-ip - join
TCP and IP network protocols.
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linux.kernel - join
linux-kernel@vger.kernel.org (Moderated)
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comp.unix.shell - join
Using and programming the Unix shell.
Low activity, 4668 subscribers, Usenet

comp.lang.c - join
Discussion about C.
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comp.unix.internals - join
Discussions on hacking UNIX internals.
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comp.unix.questions - join
UNIX neophytes group.
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comp.std.c - join
Discussion about C language standards.
Low activity, 1565 subscribers, Usenet