Now Prototype is most popular between web application developers everywhere. Prototype is release License under MIT (source code) and CC BY-SA (documentation).
6 Ext JS
- Powerful and easy to use AJAX functions
- Drag and drop
- Functional programming such as AJS.map, AJS.partial
- DOM functions such as AJS.$
- AJAX JSON support (with AJS.loadJSON and AJS.serializeJSON)
- Unified position and size and events that works in all the modern browsers
12 DynAPI 3
DynAPI 3 is an open-sourced project initiated by Dan Steinman, created to make cross-browser Dynamic HTML components on a web page. The DynAPI library uses an object-oriented approach to solve problems associated with scripting for both Netscape and Internet Explorer.
13 Taojax :
subGrey is used to display DHTML modal dialogs on webpages. subGrey is based on subModal.
ASP.NET AJAX is the free Microsoft AJAX framework for building highly interactive and responsive web applications that work across all popular browsers. The ASP.NET AJAX framework includes Server-Side and Client-Side ASP.NET AJAX, the AJAX Control Toolkit, and the jQuery library that provides easy-to-use yet powerful Ajax functionality that allows developers to choose their preferred method of AJAX development, whether it is server-side programming, client-side programming, or a combination of both.
ThyAPI is a Dynamic HTML Library that permits the creation of Application-like interfaces accessible using only a browser.
zephyr is an ajax based framework for php5 developers. you can easily develop business applications using this robust framework. this is extremely easy to learn and very simple to implement.
22 Kabuki Ajax Toolkit