The Unix Socket FAQ everything about network programming
on the UNIX system.
The i18nGurus, a site carring lots of stuff about internationalization
Details about the soon-to-appear AMD Hammer (Opteron) architecure
and GNU/Linux ports to this hardware (will FOX run on it? You betcha!).
The Free Standards Group is an independent,
non-profit organization dedicated to accelerating the use and acceptance of open source technologies
through the development, application and promotion of standards.
The Red Hat Dev Net site contains a wealth of
information for development on GNU/Linux in general and Red Hat in particular.
The OpenGL website has a vast collection of OpenGL related information for graphics developers.
The Mesa3D Library is an OpenGL replacement library which can
be used on machines for which no hardware-accelerated OpenGL is available.