randomForestExplainer 
A set of tools to understand what is happening inside a Random Forest. A detailed discussion of the package and importance measures it implements can be found here: Master thesis on randomForestExplainer.
Installation
# the easiest way to get randomForestExplainer is to install it from CRAN:
install.packages("randomForestExplainer")
# Or the the development version from GitHub:
# install.packages("devtools")
devtools::install_github("ModelOriented/randomForestExplainer")