A PHP Web Service Framework : REST, SOAP, JSON, XML, PHP, Typed PHP
...This is a fastcgi (PHP native) server running in cli mode (php-cli) as a daemon. It is able to handle requests and responses using the following formats : REST, SOAP, JSON, XML, PHP and Typed PHP, these formats can be mixed. It also provides supports for asynchronous requests, credentials and request details.
(PHP Linux Only)
SANJER is a wrapper class that brings together SAJAX (the Simple AJAX toolkit) and JSON (JavaScript Object Notation). These two, when combined, allow great AJAX usability. SANJER provides a simple and convenient way to put the two to work together.
KCFinder is an alternative to the CKFinder web file manager. It can be integrated into FCKeditor, CKEditor, and TinyMCE WYSIWYG web editors to upload and manage images, flash movies, and other files that can be embedded in generated HTML content.
PHP-O-Lait is a library that, in 2 boiler-plate lines of code, allows you to call server-side PHP code from client-side JavaScript. It's so easy, in fact, that you don't need to know how it does it (hint, it uses Ajax and JSON).
webOS is a web desktop environment offering a bridge between DHTML and PHP/mySQL using Ajax and JSON. It comes with a rich set of skin based UI widgets. The API is in javascript and its cross-browser.
The JavaScript Object Notation (JSON) is a simple and lightweight data interchange format. This project provides PHP libraries for manipulating JSON objects. For more information on JSON, visit http://www.json.org/