Click Tracker - PHP script that can track all your text links and also acts to hide affiliate links from search engines. Has click count, referrer logs and more.

Multilist Manager - PHP mailing list manager. Very robust and allows multiple lists. Manage lists and mail outs from the one interface.

Mojo Mail - A great mailing list manager.

Executer - Script that allows you to execute SSI on a server that doesn't support it.

Google 100 - Use this link to easily find your site in the Google rankings without having to scroll through dozens of pages. It returns 100 results per page.

SEO Toolkit - An excellent suite of SEO tools including a search engine position checker, link popularity checker, and more.

Hot Scripts - Offers a huge range of cgi, PHP, and other programs. There are many free great scripts here.

Google Dance Tool - Check your positions during the "Google Dance" and get dance alerts.

Domain Search - Free online expired domain search tool

Mail Washer - Sick of spam? Then send it right back with Mail Washer.

Keyword Extractor - View a webpage as a search engine spider sees it. Optimize your keywords.

Ezula / Surf Killer - Courtesy of Croupier.com, this script disables Ezula and Surf preventing link theft.

WHOIS Ultra - A great domain lookup tool from Analog X. Find out if a domain is available and also domain owner information.

Ai Roboform - The Gator killer! Far better and no spyware. Fills in forms and remembers passwords.

Ad Aware - Ever noticed a lot of outgoing traffic on your connection? The ultimate spyware removing tool.

GPWA.Net - Gambling Portal Webmasters Association