Interactive & Zoomable JS Charts: dygraphs

dygraphs is an open source JavaScript charting library for displaying data of time series.

It can show values on mouseover that makes discovering the values easier & zooms any selected area.

The data can be called from a CSV file or mentioned in the code staticly (in CSV format).

The library can handle fractions intelligently & supports error bands around data series.

It works in all major browsers (IE requires excanvas) & it is compatible with the Google Visualization API.