GreenSock

The standard for JavaScript HTML5 animation

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Hunter's comment

HTML5 javascript animation built for professionals, GSAP is packed with features that make most other engines look like cheap toys. source

GreenSock (GSAP) is an animation library with ultra high-performance, professional-grade animation for the modern web.

GreenSock is purely a JavaScript animation tool that developers can use to create awesome animations that works on all modern browsers.

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Link

http://greensock.com/