There and Back Again

This is the first Hosted AJAX project i've seen. You sign up for an account create a keyword list and then copy and paste the javascript and html into your app. In no time at all you have Keyword Suggest type as you find dropdown on a text box. The only problems with this approach are the limit of 200 keywords and having to maintain the list by hand. The actual implementation is ruby using the rails framework and its prototype js library.

Includes live search, Posting of a form, an active grid, various effects and notifications as well.

Cake is a well done port of the Ruby on Rails framework to PHP. This includes all its AJAX integration with the prototype js lib. AJAX integration is all done through easy to use helper functions, but its not really standalone so if you don't want to use the entire framework its not really a solution.

Rico is a object oriented Javascript library that provides most of what you need to create AJAX applications. It supports ajax using either either content replace or callback objects. The drag and drop, effects, and behaviors so easy to use and look great in the demo. Rico is being developed by Sabre Airline Solutions and extends the Prototype js library using its effect and base classes.

script.aculo.us is built on top of prototype and adds in a large number of fully documented visual effects. It also includes a drag and drop library. Demos are provided of all features including small sample applications.