CodePen

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A front end web development playground.

CodyHouse

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A free library of ready-to-use HTML, CSS, JS components for designers and developers.

Codrops

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Codrops is a web design and development blog that publishes articles and tutorials about the latest web trends, techniques and new possibilities.

LittleSnippets.net

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A free collection of CSS3/HTML snippets. New entries crafted and added daily.