A JavaScript Toolkit For Interactive & Real-Time Graphs – Rickshaw

Rickshaw is a JavaScript toolkit, created by the developers of the stock photo service Shutterstock, for generating interactive and real-time graphs.

It is built on top of the D3.js visualization library and can render stack or line graphs.

Rickshaw JavaScript Toolkit

The graphs are interactive, respond to hovering them or their legends, items in the stack can be re-ordered with drag 'n' drops and more.

There is a good margin for customization: colors, sizes, interpolation and functionality in general with the modular/extendable structure of the toolkit.