This package provides functions and themes to complement the ggplot2 graphics package for R available on CRAN.
ls(package:ggextra)
"area" "arrange" "chooseCol" "colorStrip" "createCol" "dichromat.maxcolors"
"dichromat.names" "dichromat.pal" "dichromat.types" "ellipseGrob" "fieldGrob" "fielduvGrob"
"geom_ellipse" "geom_field" "geom_fielduv" "geom_ngon" "geom_star" "GeomCustom"
"GeomEllipse" "GeomField" "GeomFielduv" "GeomNgon" "GeomStar" "ngonGrob"
"polygon.regular" "scale_abscissa" "scale_alpha_manual" "scale_angle" "scale_angle_discrete" "scale_angle_manual"
"scale_ar" "scale_ar_discrete" "scale_ar_manual" "scale_colour_dichromat" "scale_fill_dichromat" "scale_length"
"scale_length_manual" "scale_ordinate" "scale_sides" "scale_sides_manual" "ScaleAbscissa" "ScaleAngle"
"ScaleAngleDiscrete" "ScaleAr" "ScaleArDiscrete" "ScaleDichromat" "ScaleLength" "ScaleLengthDiscrete"
"ScaleOrdinate" "ScaleSides" "star" "starGrob" "theme_bb" "theme_bw2"
"theme_dark" "theme_flashy" "theme_gray2" "theme_minimal" "theme_talk" "vp.layout"
The project summary page you can find here.