callr (>= 3.2.0), codetools, covr, crayon, curl, debugme,
parallel, testthat, withr

Gábor Csárdi [aut, cre, cph] (<https://orcid.org/0000-0001-7098-9676>),
  Winston Chang [aut],
  RStudio [cph, fnd],
  Mango Solutions [cph, fnd]

A backend for the selecting functions of the 'tidyverse'.
    It makes it easy to implement select-like functions in your own
    packages in a way that is consistent with other 'tidyverse'
    interfaces for selection.

covr, crayon, dplyr, knitr, magrittr, rmarkdown, testthat (>=
2.3.0), tibble (>= 2.1.3), withr

Tools for Splitting, Applying and Combining Data

person(given = "Hadley",
           family = "Wickham",
           role = c("aut", "cre"),
           email = "hadley@rstudio.com")

A set of tools that solves a common set of
    problems: you need to break a big problem down into manageable pieces,
    operate on each piece and then put all the pieces back together.  For
    example, you might want to fit a model to each spatial location or
    time point in your study, summarise data by panels or collapse
    high-dimensional arrays to simpler summary statistics. The development
    of 'plyr' has been generously supported by 'Becton Dickinson'.

abind, covr, doParallel, foreach, iterators, itertools,
tcltk, testthat

Stefan Milton Bache <stefan@stefanbache.dk> and
    Hadley Wickham <h.wickham@gmail.com>

Provides a mechanism for chaining commands with a
    new forward-pipe operator, %>%. This operator will forward a
    value, or the result of an expression, into the next function
    call/expression. There is flexible support for the type
    of right-hand side expressions. For more information, see
    package vignette.
    To quote Rene Magritte, "Ceci n'est pas un pipe."

Encapsulated Classes with Reference Semantics

person("Winston", "Chang", role = c("aut", "cre"), email = "winston@stdout.org")

Creates classes with reference semantics, similar to R's built-in
    reference classes. Compared to reference classes, R6 classes are simpler
    and lighter-weight, and they are not built on S4 classes so they do not
    require the methods package. These classes allow public and private
    members, and they support inheritance, even when the classes are defined in
    different packages.