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Natto for free.

The latest version of Natto is available from the following.

   OS: Windows XP or higher
   Minimum RAM: 512MB (1GB or more recommended)

Additional Download
An R package for Natto is available from here (right-click to download).
Install from "Packages -> Install package(s) from local zip files" in the R GUI menu and load as "library(nattoR)". Type "?natto" for the reference manual.

Natto should be installed prior to call from R. If you installed Natto in other than default directory, add the installation directory to your PATH.