Plotly R Open Source Graphing Library

Plotly's R graphing library makes interactive, publication-quality graphs. Examples of how to make line plots, scatter plots, area charts, bar charts, error bars, box plots, histograms, heatmaps, subplots, multiple-axes, and 3D (WebGL based) charts.
Plotly.R is free and open source and you can view the source, report issues or contribute on GitHub.