GGally is designed to be a helper to ggplot2. It contains templates for different plots to be combined into a plot matrix, a parallel coordinate plot function, as well as a function for making a network plot.
To install this package from Github or CRAN, do the following from the R console:
# Github
library(devtools)
install_github("ggobi/ggally")
# CRAN
install.packages("GGally")