Infrastructure for extended formulas with multiple parts on the
             right-hand side and/or multiple responses on the left-hand side
	     (see <DOI:10.18637/jss.v034.i01>).

c(person(given = "Achim", family = "Zeileis", role = c("aut", "cre"), email = "Achim.Zeileis@R-project.org",
             comment = c(ORCID = "0000-0003-0918-3766")),
             person(given = "Yves", family = "Croissant", role = "aut", email = "Yves.Croissant@univ-reunion.fr"))

Achim Zeileis [aut, cre] (<https://orcid.org/0000-0003-0918-3766>),
  Yves Croissant [aut]

c(person(given = "Erich", family = "Neuwirth", role = c("aut",
        "cre"), email = "erich.neuwirth@univie.ac.at"))

Provides color schemes for maps (and other graphics)
        designed by Cynthia Brewer as described at http://colorbrewer2.org

c(person("Rich", "Calaway", role="cre", email="richcala@microsoft.com"),
             person("Revolution", "Analytics", role=c("aut", "cph")),
			 person("Steve", "Weston", role="aut"))

Support for iterators, which allow a programmer to traverse
        through all the elements of a vector, list, or other collection
        of data.

Rich Calaway [cre],
  Revolution Analytics [aut, cph],
  Steve Weston [aut]

Tools for package development, administration and documentation.

Differential Evolution Optimization in Pure R

c(person("Eduardo L. T.", "Conceicao", role = c("aut", "cre"),
                    email = "mail@eduardoconceicao.org"),
             person("Martin", "Maechler", role = "ctb",
                    email = "maechler@stat.math.ethz.ch")
             )

Eduardo L. T. Conceicao <mail@eduardoconceicao.org>

Differential Evolution (DE) stochastic algorithms for global
  optimization of problems with and without constraints.
  The aim is to curate a collection of its state-of-the-art variants that
  (1) do not sacrifice simplicity of design,
  (2) are essentially tuning-free, and
  (3) can be efficiently implemented directly in the R language.
  Currently, it only provides an implementation of the 'jDE' algorithm by
  Brest et al. (2006) <doi:10.1109/TEVC.2006.872133>.