We are strong supporters of the open source community and are the developers of the following R packages:
XLConnect is one of the most widely used open source R packages for manipulating Excel files.
rTRNG provides efficient, parallel, reproducible, and fair pseudo-random number generation for large-scale Monte Carlo simulations. The rTRNG package is based on the TRNG C++ library and provides a user-friendly R interface to it via Rcpp and RcppParallel packages.
See our GitHub repository for further details.