Package ggExtra
ggExtra - Add marginal histograms to ggplot2, and more ggplot2 enhancements | Installation | Marginal plots RStudio addin/gadget | Usage | ggMarginal - Add marginal histograms/boxplots/density plots to ggplot2 scatterplots | Using ggMarginal() in R Notebooks or Rmarkdown | removeGrid - Remove grid lines from ggplot2 | rotateTextX - Rotate x axis labels | plotCount - Plot count data with ggplot2