Perform sparse hierarchical clustering and sparse k-means clustering (sparcl)
Implements the sparse clustering methods of Witten and Tibshirani (2010): ‘A framework for feature selection in clustering’; published in Journal of the American Statistical Association 105(490): 713-726.

Flexibly Reshape Data: A Reboot of the Reshape Package (reshape2)
Flexibly restructure and aggregate data using just two functions: melt and dcast (or acast).

Installing, Managing, and Switching Between Distinct Sets of Installed Packages (switchr)
Provides an abstraction for managing, installing, and switching between sets of installed R packages. This allows users to maintain multiple package libraries simultaneously, e.g. to maintain strict, package-version-specific reproducibility of many analyses, or work within a devel/release paradigm. Introduces a generalized package installation process which supports multiple repository and non-repository sources and tracks package provenance.