A drop-in AJAX contact form that can be used in WP.
Heatmap for your website
ClickHeat is a visual heatmap of clicks on a HTML page, showing hot and cold click zones. Requires Javascript on the client to track clicks, PHP and GD.
Digg - like spy script
Examples and code on how to create a digg spy page.
Bubble Tooltips
Bubble Tooltips are an easy way to add (via a bit of CSS and javascript) fancy tooltips with a balloon shape to any web page.
Edit-in-Place with Ajax
AJAX, DOM, whatever you call it makes it possible to let people edit a piece of text inline without having to use a submit button.
Ajax Tabs Content script
This tab content script uses Ajax to let you display a selection of external content on your page inside a DIV and via CSS tabs!
Dragable RSS boxes script
Tutorial and downloadable files to create draggable boxes like on online desktops.
AJAX poller script
Ajax / Php / Mysql script used to add a poll box in your website.
Dragable content script
Dragable content script. Drag and drop boxes.
Lightbox/Modal window effect using CSS
Particle Tree posted an article the other day on how to modify the Lightbox javascript to work with regular divs and not just images.
AJAX Fisheye List Widget
Demonstration of the Dojo Fisheye Widget
Google X script
Fisheye google like menu.
Ajax subscription box
Based on Wordpress, Dayfox Blog 4 uses flat files to store everything, there is no need for a mySQL database.
Googlemap with geocode support
SOLMETRA Maps is a PHP class meant to simplify display of Google Maps on your site.
Browser-based instant messaging client
Asynchronous javascript and xml instant messenger. Looks a bit like meebo.
Ajax domain search script
Instant domain name search result. (Depend on your server connection speed.)
Amberjack site tours
Amberjack is a lightweight Open Source library, enabling webmasters to create cool site tours.
Gmail style, AJAX check username signup
Gmail Style, AJAX Check Username Signup. The example uses PHP and AJAX (via Sajax development version) to complete this task.
Easy Ajax with ASK
The purpose of ASK is to offer you a simple way to get content into your page on-the-fly through asynchronous JavaScript and XmlHttpRequest, without sacrificing accessibility or usability.
Really Easy Field validation with Prototype
Here's a form validation script that is very easy to use.
ModalBox 1.5 - User friendly web-based
ModalBox is a JavaScript technique for creating modern (Web 2.0-style) modal dialogs or even wizards (sequences of dialogs)
Magnetic AJAX
This is just like the magnetic word kits you've seen before except this is on the internet!
ThickBox 2.1.1 - a webpage UI dialog widget
ThickBox is a webpage UI dialog widget written in JavaScript on top of the jQuery library.
Suckerfish HoverLightbox
A very nice implementation of a javascript gallery.
Smoot - Web-based diagram and GIS tool
Smoot is a Web-based tool for creating diagrams of icons and links between them.