I am involved in the development of the following R packages. The packages are available on CRAN (the Comprehensive R Archive Network). Some of the packages have their own homepage which may contain development versions and other resources.

CRAN | Homepage | DESCRIPTION |

gRain | Homepage | Graphical Independence Networks |

gRim | Homepage | Graphical Interaction Models |

gRbase | Homepage | Graphical modelling in R - base package |

gRc | Homepage | Graphical Gaussian Models with Edge and
Vertex Symmetries |

pbkrtest | Homepage | Parametric bootstrap and Kenward Roger based methods for mixed model comparison |

doBy | Homepage | Groupwise summary statistics, general linear contrasts, LSMEANS (least-squares-means), and other utilities |

geepack | Generalized Estimating Equation Package | |

Ryacas | Homepage | R interface to the yacas computer algebra system |

Other software:

GUYacas is a graphical user interface (GUI) on Windows platforms to the Yacas computer algebra system.