Our users often recommend useful sites in response to a question. But the recommendations seem to get lost among our threads only to get re-recommended later. I will try to collect these here. I won't duplicate sites mentioned in Unix Tutorials/Programming Tutorials/Shell Scripting Tutorials, so check that FAQ thread as well. I have decided to move references to the Usenet Unix Faq to a separate thread (USENET Unix FAQS) so they don't overwhelm this thread. I will reject sites that seem easy to find, such as www.sun.com or www.samba.org. This still leaves hundreds, perhaps even thousands of sites. I will use my best judgement in an attempt at constructing a compact but useful list.

General Documention
How To Ask Questions The Smart Way ................. mentioned in script
The Linux Documentation Project ........................ mentioned in *nix newb needs books
Unix History .................................................... mentioned in Click here for the best unix in the world!!!!
The Creation of the UNIX Operating System .......... mentioned in The Creation of the UNIX* Operating System
ROSETTA STONE ............................................. mentioned in you have more and one unix type?

C Programming
Download Advanced Linux Programming ................ mentioned in pipe read and write with many forked children
cURL .............................................................. mentioned in http library in C
apfloat - Arbitrary Precision Arithmetic Package ..... mentioned in a simple fundamental
The International Obfuscated C Code Contest ....... mentioned in Obfuscated C

Shells
Csh Programming Considered Harmful ................... mentioned in Length of a variable
Useless Use of Cat Award .................................. mentioned in read input file for batch job
Heiner's SHELLdorado ........................................ mentioned in Tidying up temp files on exit of script
HotScripts ...................................................... mentioned in Stupid find trick
Z-Shell Frequently-Asked Questions ..................... mentioned in tutorials about zsh


awk and sed
HANDY ONE-LINERS FOR SED .............................. mentioned in formating number strings
the SED $HOME ............................................... mentioned in sed help
sed & regular expressions .................................. mentioned in help need on nawk script
The AWK Manual .............................................. mentioned in AWK question in the KORN shell
comp.lang.awk FAQ ......................................... mentioned in help need on nawk script

misc
The Vi Lovers Home Page ................................. mentioned in how to change the tab size in vi?
Fortran under Linux ......................................... mentioned in how to find and install fortran 90 in Redhat
ServerWatch ................................................. mentioned in Optimizing Apache Server Performance
Info-ZIP ....................................................... mentioned in zip utility on HP-UX
Wotsit's Format, The Programmer's Resource.........mentioned in creating more than 2 excel sheets in C

Developer Sites
FreshMeat ...................................................... mentioned in Mail utilities and editors.
SourceForge.net ............................................. mentioned in Learning to program in c