GURPS: Generic Universal Roleplaying System The official Steve Jackson Games page for GURPS. Features news on new and upcoming releases, and links to the massive SJ Games library of online resources.
GURPS Lite A distilled, complete version of the GURPS Basic Set in 32 pages, available as a free download. Designed both for newcomers to GURPS and as a tool for experienced GMs to teach the game to others.
GURPS Character Repository A collection of characters, adventures, house rules and links. By SD Anderson.
Blue Room GURPS A large collection of "classic era" GURPS articles, adventures, design notes, and product ratings by S. John Ross, author of GURPS Warehouse 23 and other supplements. Includes the Unlimited Mana rules.
GURPS Stuff by Scott Maykrantz A collection of articles, rules, and notions from the keyboard of Scott Paul Maykrantz, author of GURPS Creatures of the Night.
Ebon Tower Fantasy Gaming A general-purpose fantasy gaming webzine with a strong GURPS slant. Site includes templates, revised rules, and a campaign setting.