Features:

-Handles huge data sets: dygraphs plots millions of points without getting bogged down. Interactive out of the box: zoom, pan and mouseover are on by default.

- Strong support for error bars / confidence intervals.

- Highly customizable: using options and custom callbacks, you can make dygraphs do almost anything.

- dygraphs is works in all recent browsers. You can even pinch to zoom on mobile/tablet devices!

- There's an active community developing and supporting dygraphs.