JavaScript: Development

Lightweight JavaScript browser sniffer/detector class that gives information about browser type and version
Price: Free (Restricted License)

Creativyst's JavaScript compressor allows you to format and comment your JavaScript code liberally and then compress it all out of your distribution script. You may use whatever JavaScript coding style you'd like, such as line-feeds without...
Price: Free / $7

A Javascript Program that Exposes the HTML DOM Tree for browsing and editing. Enumerates HTML Object and Event Object Properties. Javascript Console and Error Log. Useful for Debugging HTML Pages, DHTML Scripts, and Cross-Browser Compatibility. ...
Price: GPL

Use this online tool to automatically convert HTML into JavaScript document.write code. Useful for simulating server-side includes where SSI is not available and for including conditional HTML into script.
Price: Freeware

With this script you easly can detect which browser your visitor is using and if the browser is D.O.M. compatible.
Price: Freeware

E-mail Obfuscator is an online tool for webmasters that obfuscates e-mail addresses that you enter, making them less vulnerable to spammers who use e-mail harvesting software, also called spam-bots.
Price: Free

Cross-platform JavaScript method for retrieving style information set in either a CSS style sheet, a block, or inline
Price: Free

Use this highly versatile application to compile the source code of your webpages and protect them from theft. HTML Compiler 2.0.1 implements the JavaScript encrypting method unescape and converts your code into a single line encrypted script...
Price: 15USD

Have you ever pulled your hair writing java-script for setting and resetting elements in an HTML form with a hierarchy of form elements? Here is an easy way to handle all that. Visit www.appsandtools.com and click on 'Products'.
Price: Free

this code parser gives you the whole document structure in a popup [xhtml strict]
Price: 0

There is further documentation and examples on the linked document. Please visit that to get a demonstration and to download the actual document to include into your site.
Price: Free

jsAssertUnit is a unit testing framework based on assertions, helping JavaScript developers to test their code. Failing assertions about the program state are tracked in a Reporter window of a DOM compliant browser : IE5+, Mozilla, Netscape 6+, etc.
Price: Free (GPL)

A program written in Javascript and DHTML. It takes the Javascript (or even a self contained Web Page), removes the white space, comments and line breaks, and replaces function names and variable names with meaningless hash values. By using hash...
Price: Freeware

A simple and light, yet powerful javascript utility that allows you to print debug statements, view and modify page variables as well as execute functions and dynamically create functions that has access to the running browser state.
Price: Freeware

Tired of unordered, unclear and overlapping JavaScript files, or just looking for an easy way to separate your JavaScript from your (X)HTML? So was I, hence the creation of JSPackaging. Through the use of 3 components (JSPackage, JSImport and...
Price: Free (GPL, LGPL, MPL 1.1)

What it is good for: ================ The HTML/JavaScript Cruncher (also known as squeezing): Removes whitespace and comments in ALL your JavaScript-Blocks, Style-Sheet-Blocks, HTML-Blocks. This results in Bandwidth-Savings between 20% -...
Price: Freeware

The library includes cross-browser implementation of a button, checkbox, progress bar, counter, overlay window, dialog box etc. QLIB differs from lots of similar collections mainly by propagating the OOP principles into JavaScript. Object...
Price: Free (GPL)

JavaScript Class that allows for generic setting and removing of event listeners
Price: Free (Restricted License)

Tool for compressing JavaScript source code. Eliminates comments, white spaces, line feeds, and other unnecessary characters, making your JavaScript source code substantially smaller so that it can be downloaded faster. Also provides lightweight...
Price: $27.00

Generic JavaScript method that allows the user to save a link to a page. If the browser is Internet Explorer, a bookmark is saved. If the browser is in the Gecko family, a tab is added to the sidebar.
Price: Free (Restricted License)