Bulk Whois API - Enables the whois database to be queried programmatically so as to determine the registration status of a list of domains.
Category Creation and Description Tools - Javascript tools to create the same category in multiple subcategories, create multiple subcategories in the same category, and add the same description to a series of subcategories.
CatSpider - Can display amount of unreviewed, cool sites, listed editors, and category descriptions.
Create Subcat From Edit Page - Bookmarklet that will create a new subcategory and prepare to move the current site there.
DeCJB - Displays the real URL behind a CJB redirect.
Frame-Based Search - Allows stepping through of editable search results.
kbacon - Shows the Kevin Bacon connection of any act[or/ress] that the @link structure can support. Ran without arguments, a person is selected at random.
NetGeo - The Internet Geographic Database - Database and collection of Perl scripts used to map IP addresses, domain names and AS numbers to geographical locations.
Worldlinkerator - Makes the process of creating alternative language links between the various languages faster, easier, and potentially more comprehensive.