A user-friendly, highly customizable R package for building
    horizon plots in the 'ggplot2' environment.

Splits date and time of day components from
    continuous 'datetime' objects, then plots them using grammar
    of graphics ('ggplot2'). Plots can also be decorated with
    solar cycle information (e.g., sunset, sunrise, etc.).
    This is useful for visualising data that are associated with
    the solar cycle.

Supports image files and graphic objects to be visualized in
    'ggplot2' graphic system.

Provides two new layer types for displaying image data as layers
  within the Grammar of Graphics framework. Displays images using either a
  rectangle interface, with a fixed bounding box, or a point interface using a
  central point and general size parameter. Images can be given as local
  JPEG or PNG files, external resources, or as a list column containing
  raster image data.

Provide specialized 'ggplot2' layers and scales for spatial
    uncertainty visualization, including bivariate choropleth maps, pixel maps,
    glyph maps, and exceedance probability maps.

Visualise the results of F test to compare two variances, Student's t-test, test of equal or given proportions, Pearson's chi-squared test for count data and test for association/correlation between paired samples.

Extensions to 'ggplot2' providing low-level debug tools: statistics
    and geometries echoing their data argument. Layer manipulation: deletion,
    insertion, extraction and reordering of layers. Deletion of unused variables
    from the data object embedded in "ggplot" objects.

A 'ggplot2' extension that enables visualization of IP
    (Internet Protocol) addresses and networks. The address space is
    mapped onto the Cartesian coordinate system using a space-filling
    curve. Offers full support for both IPv4 and IPv6 (Internet Protocol
    versions 4 and 6) address spaces.

A tool to process and analyse data collected with wearable raw acceleration sensors as described in Migueles and colleagues (JMPB 2019), and van Hees and colleagues (JApplPhysiol 2014; PLoSONE 2015). The package has been developed and tested for binary data from 'GENEActiv' <https://activinsights.com/>, binary (.gt3x) and .csv-export data from  'Actigraph' <https://theactigraph.com> devices, and binary (.cwa) and .csv-export data from 'Axivity' <https://axivity.com>. These devices are currently widely used in research on human daily physical activity. Further, the package can handle accelerometer data file from any other sensor brand providing that the data is stored in csv format. Also the package allows for external function embedding.