Webmasterkit.info

swfir is an image styling script that lets you rotate, round image corners, and much, much more:
You can choose from any of these parameters:
border-radius
border-width
border-color
shadow-offset
shadow-angle
shadow-alpha
shadow-blur
shadow-blur-x
shadow-blur-y
shadow-strength
shadow-color
shadow-quality
shadow-inner
shadow-knockout
shadow-hide
rotate
overflow
link
elasticity
Link

This Java and Flash script generates countless types of charts and graphs (and animates them)
From the site:
Key features:
Animated or static
Pull the slice in or out on click
3D or 2D
Values can be displayed in the legend
Custom description for any slice
Clickable slices (you can use this feature for drill-down charts)
Grouping small slices into one slice
Partial pies
Common amCharts […]

Amberjack is an easy to use and super tiny (4K) script that allows you to create tours of your site. It’s also skinnable (see image above)
Link

Using this script you can use non-standard fonts on your website. Not that you couldn’t do that before by using an image, but this does it for you automatically If you change your font later you only need to change the code, not all the images.
 
From the site:
"Facelift Image Replacement (or FLIR, pronounced fleer) […]

The Timeline script creates a DHTML timeline from data stored in an XML file. Just click and drag left or right to move through the timeline. This script requires no software installation on your server.
Link

 
This free Javascript allows you to automatically add highlights to map areas on mouseover  without having to manually create rollover images for each area of the map.
Link

PHP Speedy is a script that promises to dramatically speed up your load times. It works by combining and compressing the files needed on the web page thereby reducing the amount of data called from the server.
Link