The R package VSURF is available on CRAN (and under development on github).
VSURF stands for Variable Selection Using Random Forests.
The package is fully described in the following article :
R. Genuer, J.-M. Poggi, C. Tuleau-Malot VSURF: An R Package for Variable Selection Using Random Forests. The R Journal, 7(2):19-33 (2015) [pdf]