I attended several talks about R at the Joint Statistics meetings and noted some interesting packages and other resources during these talks. I lost track of that list until recently, but they are still relevant, so here they are.
Data Science with R, Garrett Grolemund, http://garrettgman.github.io
gitlab, https://about.gitlab.com
profvis, https://rstudio.github.io/profvis/
sparklyr, http://spark.rstudio.com
readr, http://blog.revolutionanalytics.com/2015/04/new-packages-for-reading-data-into-r-fast.html
purrr, https://blog.rstudio.org/2015/09/29/purrr-0-1-0/
tibble, https://blog.rstudio.org/2016/03/24/tibble-1-0-0/
haven, https://www.r-bloggers.com/reading-spss-data-into-r-with-haven/