Ext GWT is a Java library for building rich internet applications with the Google Web Toolkit (GWT)

Prototype is a JavaScript Framework that aims to ease development of dynamic web applications.

moo.fx is a superlightweight, ultratiny, megasmall javascript effects library, to be used with prototype.js or the mootools framework.

It's very easy to use, blazing fast, cross-browser, standards compliant, provides controls to modify any CSS property of any HTML element, including colors, with builtin checks that won't let a user break the effect with multiple, crazy clicks.

Google Web Toolkit (GWT) makes it easier to write high-performance AJAX applications. You write your front end in the Java programming language and GWT compiles your source into highly optimized JavaScript.

Laszlo is an open source platform for the development and delivery of rich Internet applications on the World Wide Web.

The Laszlo platform consists of the LZX language and the Laszlo Presentation Server.

- LZX is an XML and JavaScript description language similar in spirit to XUL and XAML. LZX enables a declarative, text-based development process that supports rapid prototyping and software development best practices.

- The Laszlo Presentation Server (LPS) is a Java servlet that compiles LZX applications into executable binaries for targeted run-time environments. Laszlo currently targets the Flash Player. The LPS compiles LZX applications into SWF bytecode for the Flash Player, serves and caches these compiled applications to any Web browser enabled with Flash 5 or later, and proxies application requests for back-end XML data sources and web services.