http://tutorialzine.com/2014/07/20-impressive-css3-techniques-libraries-and-examples/
Libraries
Bootstrap
Bootstrap is a mobile responsive framework. There are lots or similar HTML, CSS, JS Grid frameworks. If you need to start somewhere, why not start with the most popular framework?
Some Alternatives: Semantic UI
Fancybox
fancyBox is a tool that offers a nice and elegant way to add zooming functionality for images, html content and multi-media on your webpages. It is built on the top of the popular JavaScript framework jQuery and is both easy to implement and a snap to customize.
Waypoints
Waypoints is a library that makes it easy to execute a function whenever you scroll to an element.
Animate.css
CSS animations
Flickity
Useful CSS & JS plugin that makes galleries, sliders, and carrousels that are touch responsive.