While R does require some knowledge of programming and therefore may not be considered as easy to use as Excel, there is a huge amount of information available online on how to use it (google “R Cran” or “R statistics”). There are also a number of free courses available that will teach you how to use it. That being said, to our knowledge, there is no ready-made 'R' script specifically designed to run Monte Carlo for our purposes.
(Anna McMurray, Winrock International)