The home of an enormous stew of GURPS variants and expansions, most notably "GURPS Gulliver," which begins by adressing issues of scale and goes on to re-tool half the system for sharper performance.
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.
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.
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.
Incanus' collection of scraps, tidbits, articles, and variants - dozens of GURPS items, including original work and articles culled from Usenet and sundry sources.