XmdvTool - http://wwwcip.informatik.uni-erlangen.de/user/tntimm/XmdvTool.html
The Xmdv Tool allows users to visually explore multivariate data in a variety of methods. The major concepts which users need to grasp to be able to effectively utilize Xmdv Tool are the data projection techniques available and the use of the N-dimensional brush.
Note: This info converted from the original "The Data Mine" pages and pre-dates June 2001. Please remove this note if you update or check the info