There and Back Again

AJAX implementation supporting PHP & ASP, dual licensed under GPL and LGPL. Calls are made using cpaint_call function in javascript which you provide a remote page, method, function to call, arguments, callback function, and return type. This makes for rather complex calls but for basic return types it can be fast since you can return a single item directly as text. For complex types functions are provided for creating a custom xml format in PHP or ASP.

A basic javascript library which serializes javascript data types into xml-rpc payloads. JavaScript Remote Scripting is used for communication with the server. The actual usage seems pretty raw, since there is no wsdl or other proxy generation support. All major JavaScript datatypes are supported and the code includes a php script which acts as a proxy to any XML-RPC service. The actual XML-RPC generation code looks easy to use with other tranports if needed.

Quick article showing how to do basic AJAX abd some Generic XML interaction with Sarissa

Cross-browser wrapper for native XML APIs. It offers various XML related goodies like Document instantiation, XML loading from URLs or strings, XSLT transformations, XPath queries. Provides an XMLHttpRequest wrapper thats supports synchronous and asynchronous operation.