I use dplyr, ggplot and plotly packages most of the time, R studio is a great way to do data manipulation(dplyr) and visualization(ggplot)

statistical, data manipulation, NLP and machine learning libraries

The interface of RStudio is great. Once you assign a name to a certain dataframe or object, it stores it in the environment and you can always view them. It is also really easy to install new packages. It is also open source, which is great, and all the packages are freely available and easy to understand.