dygraphs is a fast, flexible open source JavaScript charting library.

It allows users to explore and interpret dense data sets.

The chart is interactive:

• you can mouse over to highlight individual values.
• You can click and drag to zoom.
• Double-clicking will zoom you back out.
• Shift-drag will pan.
• You can change the number and hit enter to adjust the averaging period.

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.

Comfortable

C3 makes it easy to generate D3-based charts by wrapping the code required to construct the entire chart. We don't need to write D3 code any more.

Customizable

C3 gives some classes to each element when generating, so you can define a custom style by the class and it's possible to extend the structure directly by D3.

Controllable

C3 provides a variety of APIs and callbacks to access the state of the chart. By using them, you can update the chart even after it's rendered.

C3 enables deeper integration of charts into your application.

d3-shape - Graphical primitives for visualization, such as lines and areas.