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Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
CodePen - A front end web development playground.
Code Cola - Code Cola is a chrome extension to editor online pages' style visibility.
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
Fiddler - Fiddler is a debugging program for websites.
JS Bin - Sample of the bin: