This one is for the web developer. JSFiddle is a really convenient way to build, manage, and share your HTML, CSS, and JavaScript code.

Similar to JS Bin, JSFiddle allows you to test your “fiddle” across various browsers and devices using any number of existing frameworks such as jQuery, Dojo, and Prototype (waiting for them to include Bootstrap by Twitter which I just started tinkering with for an upcoming project).

JSFiddle is a godsend for the development community, especially those that frequent sites like Stack Overflow. Now there is no excuse to clutter up the forums with “reams” of (faulty) code when asking for help troubleshooting a bug. Create a JSFiddle and provide a public link.

JSFiddle lets you fine tune, save, and share multiple versions of your code.