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→Websites: rm link to defunct LIS Stack Exchange
* JS Fiddle http://jsfiddle.net/
* CodePen http://codepen.io/
* [http://stackexchange.com/ StackExchange] (by extension, StackOverflow and [http://libraries.stackexchange.com/ the Libraries StackExchange] site).
* [http://css-tricks.com CSS Tricks ]
* [http://openhatch.org/ Open Hatch] - to learn tools you need to participate in open source development and find friendly projects to be a part of