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Learn Node.JS with interactive lessons Install these choose-your-own-adventure style lessons and learn how to use node.js, npm and other related tools by writing code to solve realistic problems. The lessons run in your terminal and work on Windows, Mac and Linux. Select a lesson below to get started!

Clj is a Clojure REPL and package management system.

In this set of free web applications for web developers, we've included some incredibly nice resources, and also web applications that even blew me away. Javascript compressors, Wordpress theme creator, an extremely nice form generator service, Myspace theme creator and more.

A Service Mapping Description (SMD) is a JSON representation describing web services. An SMD can defines the various aspects of a web service such that clients can coherently interact with the web services. An SMD can be used by generic tools to generate interfaces, human and programmatic, to access available web services. A wide array of web services can be described with SMD including REST services and JSON-RPC services. The SMD format is designed to be flexible, compact, simple, readable, and easily implemented.

This JavaScript utility allows you to interactively browse the Document Object Model representation of a page. Its designed to help developers in finding the various objects, properties and values associated with elements and other objects in an web page.

Some of the very best web development favelets available including MODI and DOM inspector

Features: You can enter statements and expressions at the same prompt. The result of each non-void statement or expression is shown. User-defined variables. b = document.body User-defined functions. function f() { return 5; } JavaScript error messages are shown in red. Previous statements and expressions are available through Up and Down arrow keys. Tab completion. Multiline input (Shift+Enter to insert a line break). If the shell is opened using a bookmarklet, JavaScript typed into the shell runs in the context of the original window. Works well in Firefox, mostly works in Opera 8 and in IE 6 for Windows. Suggested uses: Test short bits of JavaScript, bookmarklets, or user scripts. (For longer bits of JavaScript, try the JavaScript development enviornment too.) Explore DOM objects such as document.body using props (Alt+P) to figure out what is possible. Explore the DOM of a specific page using the bookmarklet version of the shell. Modify the DOM of a specific page using the bookmarklet version of the shell. Use the shell like you would use the home screen of a calculator such as a TI-83. Alt+M gives you easy access to math functions such as sin and pow.

JavaScript Countdown/Count-up Timer/Clock/Ticker for Web Pages

Superb tool for analsysing the performance of web pages - extends the equally superb Firebug.
Hint: Use Firefox for web development!!

Very useful tool for analysing web page performance