When comparing Famous vs Velocity.js, the Slant community recommends Velocity.js for most people. In the question“What are the best JavaScript animation frameworks or libraries?” Velocity.js is ranked 3rd while Famous is ranked 5th. The most important reason people chose Velocity.js is:
It significantly increases speed over the default .animate() as it uses CSS transitions. This is not true for all platforms though. For example GSAP uses basic Javascript animation but does tricks to speed things up.
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Pros
Pro 3D physics engine
Famous offers a 3D engine through via WebGL. This engine is very similar to those found in videogame engines.
Pro Amazing performance
Famous makes it possible to create animations through DOM and WebGL that are up to 60FPS. In other words, the Famous engine is able to create native animations inside the web browser.
Pro Open Source
Famous is a free and open source project released under the MIT License.
Pro SEO friendly
Since Famous renders on DOM (as well as WebGL) it's SEO friendly, because web crawlers can read everything that's rendered on the DOM.
Pro Drop in replacement for JQuery.animate()
It significantly increases speed over the default .animate() as it uses CSS transitions. This is not true for all platforms though. For example GSAP uses basic Javascript animation but does tricks to speed things up.
Cons
Con Dead project
Famous has been abandoned and will not get updates or bug fixes anymore.