3 packages on CRAN
It handles numerics, characters, factors, and logicals.
Provides a general-purpose tool for dynamic report generation in R using Literate Programming techniques.
Provides R bindings to the 'Sundown' Markdown rendering library (<https://github.com/vmg/sundown>). Markdown is a plain-text formatting syntax that can be converted to 'XHTML' or other formats. See <http://en.wikipedia.org/wiki/Markdown> for more information about Markdown.