Using R to Install Stuff on Windows OS (Such As: R, 'Rtools',
'RStudio', 'Git', and More!)
R is great for installing software.  Through the 'installr'
    package you can automate the updating of R (on Windows, using updateR())
    and install new software. Software installation is initiated through a
    GUI (just run installr()), or through functions such as: install.Rtools(),
    install.pandoc(), install.git(), and many more. The updateR() command
    performs the following: finding the latest R version, downloading it,
    running the installer, deleting the installation file, copy and updating
    old packages to the new R installation.
curl, XML, devtools, rjson, data.table, plyr, ggplot2, sp,
tools, pkgbuild (>= 1.1.0), testthat (>= 2.1.0), mockery,
R.utils
Tal Galili [aut, cre, cph] (http://www.r-statistics.com),
  Barry Rowlingson [ctb],
  Boris Hejblum [ctb],
  Dason [ctb],
  Felix Schonbrodt [ctb],
  G. Grothendieck [ctb],
  GERGELY DAROCZI [ctb],
  Heuristic Andrew [ctb],
  James [ctb] (http://stackoverflow.com/users/269476/james),
  Thomas Leeper [ctb] (http://thomasleeper.com/),
  VitoshKa [ctb],
  Yihui Xie [ctb] (http://yihui.name),
  Michael Friendly [ctb] (http://datavis.ca/),
  Kornelius Rohmeyer [ctb] (http://algorithm-forge.com/techblog/),
  Dieter Menne [ctb],
  Tyler Hunt [ctb] (https://github.com/JackStat),
  Takekatsu Hiramura [ctb] (https://github.com/hiratake55),
  Berry Boessenkool [ctb] (https://github.com/BerryBoessenkool),
  Jonathan Godfrey [ctb] (https://github.com/ajrgodfrey),
  Tom Allard [ctb],
  ChingChuan Chen [ctb],
  Jonathan Hill [ctb],
  Chan-Yub Park [ctb] (https://github.com/mrchypark),
  Gerhard Nachtmann [ctb],
  Russ Hyde [ctb],
  Lyndon D'Arcy [ctb] (https://github.com/logworthy),
  Gerhard Burger [ctb] (https://github.com/burgerga),
  Adrian Hordyk [ctb] (https://github.com/AdrianHordyk),
  Arthur Gailes [ctb] (https://github.com/arthurgailes)