There and Back Again

A JavaScript to Java rpc mechanism using JSON. Supports mapping Java objects to JavaScript, this mapping is done at object creation time instead of using pregenerated proxy objects like most approaches. The java side is a Servlet, a bridge is also provided for using in JSP pages. Out of the box supports a large number of Java types, includes Class hinting support to help manage the process.

Bitkraft is a CLR based (.NET) web framework. It is written in C# and compiles for operation under the Microsoft .NET Framework 1.1+ or the .Mono Framework, making it portable to almost any platform. At it's core, the Bitkraft framework extends the ASP .NET Architecture to fully support Javascript-based Server callbacks using the XmlHttpRequest object as a transport to provide for AJAX communications. By extending the .NET architecture elements like web controls can be used seemlessly in an AJAX fashion.

OO PHP AJAX library, uses JSON as its serialization format, and supports events and HTML manipulation

JSON (JavaScript Object Notation) is a lightweight data-interchange format. Since its nativly understood by JavaScript it can be a useful part of a fast AJAX implementation. This is a php extension implementation of it based off of json-c.