Open Source JavaScript Browsers

Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should) also be automated as well. If you want to create robust, browser-based regression automation suites and tests, scale and distribute scripts across many environments, then you want to use Selenium WebDriver, a collection of language specific bindings to drive a browser - the way it is meant to be driven. If you want to create quick bug reproduction scripts, create scripts to aid in automation-aided exploratory testing, then you want to use Selenium IDE; a Chrome and Firefox add-on that will do simple record-and-playback of interactions with the browser. If you want to scale by distributing and running tests on several machines and manage multiple environments from a central point.

ZK is an open-source Java framework for building modern web and mobile applications. It enables developers to create rich, interactive UIs using only Java — no JavaScript required. With 200+ Ajax-powered components, event-driven architecture, and support for popular technologies like Spring, Java EE, and JSP/JSF, ZK makes it simple to deliver powerful and user-friendly web applications.

ItsNat is a Component based AJAX Java Web Application Framework.No XML programming,no mixed view/code,no custom JavaScript.Only pure HTML,pure Java and server centric Swing-like programming with W3C standards where "The Browser is The Server"

Facets is a web application framework that leverages a simple MVC architecture for the server side and a feature-packed Javascript component model for the client. The two pieces are designed to be seemlessly integrated for very dynamic AJAX-style apps.

Controls developed with GWT have tightly coupled behavior with their presentation, this introduce some troubles when we need to apply new theme for UI. This library introduce painless way to decouple logic from views using plain HTML templates.

Laszlo Jsf Integration Library

RJAX (Reverse aJAX) lets the web server push data to the browser. RJAX maintains an open connection between the browser and the server using an applet in the client page. The server can execute javascript commands directly on the client.