Flotr2 is an open source library for drawing HTML5 canvas charts and graphs which is a fork of the popular flotr without the dependency of Prototype JS framework and has many improvements.
The library is framework independent and has support for line, bar, candle, pie and bubble charts.
Features:
- Mobile support
- Framework independent
- Extensible plugin framework
- Custom chart types
- FF, Chrome, IE6+, Android, iOS

There are lots of customization options offered like the ability to define titles, subtitles, colors, labels on/off and so many others for each and every possible variable.
Flotr2 outputs are interactive, they can be set to respond to the actions of the user. And, they can be extended with plugins (there are already several ones that can add interactions, new decorations, etc.).
Requirements: No Requirements
Compatibility: All Major Browsers
Website: http://www.humblesoftware.com/flotr2/
Download: https://github.com/HumbleSoftware/Flotr2