There are a number of binary files associated with the 'Webdriver'/'Selenium' project (see <http://www.seleniumhq.org/download/>, <https://sites.google.com/a/chromium.org/chromedriver/>, <https://github.com/mozilla/geckodriver>, <http://phantomjs.org/download.html> and <https://github.com/SeleniumHQ/selenium/wiki/InternetExplorerDriver> for more information). This package provides functions to download these binaries and to manage processes involving them.