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HtmlUnit is a "GUI-Less browser for Java programs". It models HTML documents and provides an API that allows you to invoke pages, fill out forms, click links, etc... just like you do in your "normal" browser. It has fairly good JavaScript support (which is constantly improving) and is able to work even with quite complex AJAX libraries, simulating either Firefox or Internet Explorer depending on the configuration you want to use. It is typically used for testing purposes or to retrieve information from web sites. HtmlUnit is not a generic unit testing framework. It is specifically a way to simulate a browser for testing purposes and is intended to be used within another testing framework such as JUnit or TestNG. Refer to the document "Getting Started with HtmlUnit" for an introduction. HtmlUnit is used as the underlying "browser" by different Open Source tools like Canoo WebTest, JWebUnit, WebDriver, JSFUnit, Celerity, ... HtmlUnit was originally written by Mike Bowler of Gargoyle Software and is released under the Apache 2 license. Since then, it has received many contributions from other developers, and would not be where it is today without their assistance.

every browser has some good feature: it could be performances, it could be something "not standard yet", it could a feature ready for ECMAScript 5. vice-versa project aim is to bring good stuff from every browser into a single, cross-browser, lightweight, JavaScript file.

if you want your bookmarklet to work in all browsers, it has to adhere to length limits: * IE 5 - 2084 bytes * IE 6 - 508 bytes * IE 6 SP 2 - 488 bytes * IE 7 - 2084 bytes * Firefox + Safari - > 2000 bytes IE6 has the smallest length, and that includes the javascript: pseudo protocol.

"Jash is a DHTML-based window that gives you command-line JavaScript access to the current browser window. With this console you can quickly debug scripts, manipulate the DOM, view the current page's objects, functions, and variables, execute arbitrary Javascript, enter new CSS (in IE, Firefox, Opera, and Safari), and much more." - A useful tool to execute JavaScript, make live (temporary) CSS changes to a page, discover the page structure, etc. for developers. Written totally in JavaScript so can be used on any platform with any browser. Include in your own pages for debugging or load via a bookmarklet to run on any page.

SlimerJS is useful to do functional tests, page automation, network monitoring, screen capture, etc. SlimerJS is similar to PhantomJs, except that it runs on top of Gecko, the browser engine of Mozilla Firefox (specifically, version 31), instead of Webkit, and is not yet truly headless.

pi.comet an advanced javascript class to create cross browser Comet(Reverse Ajax) applications easily.It provides realtime data transfers between client and server.

Ortho is a JavaScript library for creating 2-D Graphics in Web Browsers

Xinha (pronounced like Xena, the Warrior Princess) is a powerful WYSIWYG HTML editor component that works in Mozilla based browsers as well as in MS Internet Explorer. Its configurabilty and extensibility make it easy to build just the right editor for multiple purposes, from a restricted mini-editor for one database field to a full-fledged website editor. Its liberal licence makes it an ideal candidate for integration into any kind of project.

How to set up autoconfigure scripts for various browsers that need to work on different networks/proxies (PROXY.PAC files).

Oni is a framework for managing the control flow of concurrent 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. Optimized to make you write the lesser code possible, the new moo.fx is so modular you can create any kind of effect with it. moo.fx is open source, released under the very liberal MIT License, so feel free to do anything you want with

just edit the html on the left pane, and you'll see how it rendered on the right pane as you typed.\nIt should be useful when you want to develop such as CSS or JavaScript which need to be tuned litlle by little.\nNote that the html document is automatically stored into a browser's cookie(up to approx.4kb).\nSo you can continue working on the html even after you closed the browser window.

MooShell is a shell editor where you can write your JavaScript, HTML and CSS code and run it. It might prove to be useful in various cases where you need to test your code without reloading your browser.

Unverse is a lightweight - absolutely tiny - collection of terse cross-browser javascript functions that perform common tasks, including a lightbox, ajax calls, animation and drag and drop. It implements DOMready. 

CSS Gradients via Canvas provides a subset of WebKit's CSS Gradients proposal for browsers that implement the HTML5 canvas element. To use, just include css-gradients-via-canvas.js (12KB) anywhere on the page