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Front-End Front is a place where front-end or CSS or Javascript developers can ask questions, share interesting links, and show their work to the rest of the community. It's a great looking news aggregator that works well on mobile.

Codrops is a web design and development blog that publishes articles and tutorials about the latest web trends, CSS, javascript, techniques and new possibilities. The team of Codrops is dedicated to provide useful, inspiring and innovative content.

CodyHouse's design system is an arsenal of production-ready components and tools that empower web designers to craft digital experiences faster and better. A library of HTML, CSS, Javascript components that work seamlessly with the framework.

CodePen is an online community for testing and showcasing user-created HTML, CSS and JavaScript code snippets. It functions as an online code editor and open-source learning environment, where developers can create code snippets.

CodeMyUI is a really cool repository for CSS or javascript snippets. Their main focus is on UI elements. However, do a search for “CSS snippets” and you’ll find that this site covers a much wider array of animations and features.

Sitepoint is a hub for web developers to share their passion for building incredible Internet things. Sitepoint is for web professionals, by web professionals: developers, designers, programmers, product creators and entrepreneurs alike.

Little Snippets hosts a collection of over 1000 CSS snippets. The snippets (littlesnippets.net) on Little Snippets are very modern, stylish, and often include smooth CSS or Javascript transitions. New entries crafted and added daily.

Imagehover is a lovingly crafted CSS library allowing you to easily implement scaleable image hover effects. Choose from over 40 hover effect classes from a CSS library weighing in at a minified size of only 19KB.