Create beautiful, interactive, online Plotly graphs with R and ggplot2 (plotly)
Interactive R and ggplot2 figures in your web browser

ColorBrewer Palettes (RColorBrewer)
Provides color schemes for maps (and other graphics) designed by Cynthia Brewer as described at

R Interface to Google Charts (googleVis)
R interface to Google Charts API, allowing users to create interactive charts based on data frames. Charts are displayed locally via the R HTTP help server. A modern browser with Internet connection is required and for some charts a Flash player. The data remains local and is not uploaded to Google.