AJAX may be an overused buzzword, but it also has some incredibly cool uses within your websites. We've rounded up the best AJAX tools for your perusal - free feel to add more suggestions in the comments.
AJAX Activity Indicators - A large collection of animated GIFs for you to use as your AJAX application's progress indicator.
AJAX For N00bs - Just as the site name implies, a site to help people just beginning to learn AJAX.
AJAX Mistakes - An editable list of common mistakes developers make when implementing AJAX, and suggestions on how to avoid them yourself.
AJAXFreaks.com - A collection of scripts, tutorials, forums and more.
AJAXload.info - If you can't find the perfect AJAX load icon for your project, this site will help you generate one to meet your needs.
Backbase.com - An enterprise-level AJAX development platform with numerous pre-built widgets.
dhtmlsite.com - Tons of tutorials for AJAX developers of all skill levels.
Google AJAX API - The Google API will help you implement Google services on your web page while utilizing AJAX page loading.
Google Web Toolkit - A Google-produced tool to help you become less accident-prone when writing AJAX apps.
LoadInfo.net - Customizable AJAX loading animated GIFs that are free to use.
MiniAJAX.com - A large collection of downloadable AJAX scripts, most of which are configurable.
Rialto - A cross-platform, corporate web applications driven framework.
SAJAX - A framework for calling PHP, Perl or Python from your pages without refreshing the browser.
script.acul.us - Works with Prototype, works heavily on AJAX in interfaces.
Sergiopereira.com AJAX Articles - A large collection of tutorials and code snippets to help you learn AJAX.
ThinWire.com - A Java tool to help you build AJAX apps with a GUI Desktop feel to them.
Yahoo User Interface Library - Yahoo's attempt at helping you build AJAX driven apps. (via)