This R package provides lots of plots, various labeling, axis and color scaling functions. Some of them are:

arctext: Display text on a circular arc. barhier: Display a set of hierarchically associated variables barp: A bar plotting routine bin.wind.records: Classify wind direction and speed records. centipede.plot: Display a centipede plot clock24.plot: Plot values on a 24 hour "clockface". color.legend: Legend matching categories or values to colors dotplot.mtb: Minitab style dotplots. gantt.chart: Display a Gantt chart intersectDiagram: Display set intersections multhist: Plot a multiple histogram, as a barplot polar.plot: Plot values on a circular grid of 0 to 360 degrees. vectorField: Display magnitude/direction vectors weighted.hist: Display a weighted histogram

and many more. Read more about this package at http://cran.r-project.org/web/packages/plotrix/plotrix.pdf