Released under an Apache 2 license, Snap.svg was written by Adobe's Dmitry Baranovskiy who also authored Raphaël, which is currently, the most popular library for working with SVG.
Whereas Raphaël supports browsers all the way back to IE 6, restricting it to implementing a common subset of SVG features, Snap targets modern browsers (IE9 and up, Safari, Chrome, Firefox, and Opera). which means it can support features like masking, clipping, patterns, full gradients, groups, and more.
Another feature of Snap is its ability to work with existing SVG. According to its website:
That means your SVG content does not have to be generated with Snap for you to be able to use Snap to work with it (think “jQuery or Zepto for SVG”).
It gives you the freedom to create SVG content using tools like Illustrator, Inkscape, or Sketch then manipulate it using Snap. As the website explains:
You can even work with strings of SVG (for example, SVG files loaded via Ajax) without having to render it first, which means you can do things like query specific shapes out of an SVG file, essentially turning it into a resource container or sprite sheet.
For an open source library this one is well documented. It has an 18-step slideshow to walk you through the steps to create a simple but convincing animation:
(click to access slideshow)
Alternatively you can view the short tutorial provided by the short (and snappy) Getting Started video:
You can download Snap.svg from its website or if you want to clone or fork it you can do so from GitHub.
More information in our Getting Started With Snap.svg article.