Ajax Upload is a free file uploading script with progress bar, drag & drop support. It uses XHR for uploading multiple files with progress bar in FF3.6+, Safari4+, Chrome and falls back to hidden iframe based upload in other browsers, providing good user experience everywhere. Requirements: No requirements Website: http://valums.com/ajax-upload/ License: GPL

Raxan is a powerful Open Source AJAX Application Framework that uses a set of web related technologies to deliver an integrated solution for building rich web 2.0 applications.

SAJA is an Open Source Secure AJAX Framework for PHP4 & PHP5, with optional secured data transfer. It is designed for the speedy creation of simple, secure, and maintainable AJAX applications, without the need to write any JavaScript.

LiveUI helps to create interactive web applications with minimum efforts. It’s an open source rich internet application development framework for Microsoft ASP.Net

Clean, An open source engine for Ajax, provides a high level interface to work with the AJAX technology. Clean focus is on simplicity and speed on development, keeping the focus only on AJAX issues.

JQuery/PHP Chat is a free live chat script based on popular JavaScript library and PHP, that allows to  build a simple live chat software. The good thing about this free script is that by using jQuery/PHP chat script, you don’t need to worry about any database as it will store all live chat conversation in [...]

AjaxAC is an Open Source PHP Framework for Ajax, used to develop/create/generate AJAX applications. The fundamental idea behind AJAX (Asynchronous JavaScript And XML) is to use the XMLHttpRequest object to change a web page state using background HTTP sub-requests without reloading the entire page.

midori is an ultra-lightweight JavaScript framework that gets the job done without getting in your way. The midori JS framework consists of 10 modules, all contained in a single file. You can easily add midori to any web page. Features Quickly access matching elements using CSS selectors Ajax Support Drag & Drop Pop-up Menus Auto [...]

Claros inTouch is an Open Source Ajax Webmail and IM communication suite with key features. It is an open source web application which features built in spam protection and instant messaging capabilities together with web 2.0 technologies.

ajax im is a browser-based Free Browser Based Ajax Messenger Client. It uses AJAX to create a near real-time IM environment that can be used in conjunction with community, intranet, and social websites. No refreshing of the page is ever needed for this “web application” to work, as everything is updated in real-time via JavaScript. [...]