Simple Content Rotator

Easy to use content rotator displays a random item from an unordered list. Uses CSS and Javascript.
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jQuery Slider

A very nice flexible and customizable slider script. Each slide can contain any HTML you can throw at it making it essentially a mini web page rotator.

From the site:

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Add a ‘tweet’ Button to your Posts

Easy retweet is a simple javascript/css script for adding a simple retweet button to a blog post or web page. I’m not exactly sure why it’s called a retweet as opposed to a tweet.
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Free News Rotator Script

A nice image and news rotator with a slick slide-in transition. Clicking on the numbers changes the story while hovering on them shows a pop-up preview of the story.
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Lightbox Scripts

There are dozens of Lightbox scripts out there to create galleries of all sorts. Which is right for you? It can be hard to know but here’s a great website that lets you compare about 50 of the most popular. You can even sort them by features (can show video, can show image sets, etc)

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Publish Twitter on your Website

From the site:

Put simply, Twitster is a PHP application that lets you display tweets on your own web site from everyone you follow in Twitter. What’s more, Twitster can filter those tweets by a hash tag (#example) giving you the ability to create a Twitter-based group or community on your own site.
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Tiny Accordion Script

Another fantastic script from Leigeber.com. This 1.4kb script gives you a full featured super smooth nested accordion panels. It includes multi-level support, the option to allow multiple panels to expand concurrently, and a hide/show all toggle,
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Javascript Chart Generator

JS Charts is a free JavaScript based chart generator that requires little or no coding

Features:

• • You don’t have to write code
  • It’s easy to integrate
  • It’s customizable
  • You can edit your charts online
  • You can create the three most common types of charts: bar, pie and line
  • Optionally, we host your charts on our servers
  • You can save your charts to your user account
  • It’s compatible with most web browsers
  • You don’t need any server-side plugins/modules.
  • It’s a 100% JavaScript component
  • It’s free to use and watermark-free.

Link