The R package 'ggplot2' is a plotting system based on the
    grammar of graphics.  'GGally' extends 'ggplot2' by adding several
    functions to reduce the complexity of combining geometric objects with
    transformed data.  Some of these functions include a pairwise plot
    matrix, a two group pairwise plot matrix, a parallel coordinates plot,
    a survival plot, and several functions to plot networks.

Generates concise alternative text for data visualizations created
    with 'ggplot2'. Descriptions are produced by inspecting plot layers, labels,
    scales, and facets, with support for multiple languages and alternative text
    stored in plot metadata.

Density, distribution function, quantile function and random generation for the Generalized Gamma proposed in Stacy, E. W. (1962) <doi:10.1214/aoms/1177704481>.

The grammar of graphics as implemented in the 'ggplot2'
    package has been successful in providing a powerful API for creating
    static visualisation. In order to extend the API for animated graphics
    this package provides a completely new set of grammar, fully
    compatible with 'ggplot2' for specifying transitions and animations in
    a flexible and extensible way.

Geoms for placing arrowheads at multiple points along a segment, not just at the end; position function to shift starts and ends of arrows to avoid exactly intersecting points.

A 'ggplot2' extension that adds specialised arrow geometry layers. 
    It offers more arrow options than the standard 'grid' arrows that 
    are built-in many line-based geom layers.

Automatically choose an appropriate chart type based on the
    types and values in the data. Apply more accessible default styling and colours to 'ggplot2' charts.

Mapping tools that convert place names to coordinates on the fly.
    These 'ggplot2' extensions make maps from a data frame where one of the
    columns contains place names, without having to directly work with the
    underlying geospatial data and tools. The corresponding map data must be
    registered with 'cartographer' either by the user or by another package.