ViSta is designed for students and teachers in introductory
and multivariate statistics, for researchers who have data to
analyze but are new to statistical data analysis, and for
researchers, graduate students and programmers doing research
and development in visual and computational statistics. ViSta
features state-of-the art visualization techniques to guide
novice data analysts, to portray the overall structure of a
data analysis session, to communicate the results of analyses,
and to re-estimate model parameters.

  ViSta is available for free and can be freely redistributed.