Microsoft R Open
Microsoft R Open is the enhanced distribution of open source R from Microsoft Corporation. Enhancements include multi-core processing, a fixed CRAN repository date, and reproducible R with the checkpoint package.
CRAN Time Machine
Packages extend R with new functions and data. Whether you're using R to optimize portfolios, analyze genomic sequences, or to predict component failure times, experts in every domain have made resources, applications and code available for free online.