Dataplot is a free, public-domain, multi-platform (Unix, Linux, PC-DOS, 
Windows NT, etc.) software system for scientific visualization, 
statistical analysis, and non-linear modeling.  The target Dataplot user 
is the researcher and analyst engaged in the characterization, modeling, 
visualization, analysis, monitoring, and optimization of scientific and 
engineering processes.

The original version was released by James J. Filliben in 1978 with 
continual enhancements to present.

NOTE: This port only includes the command line tool, the website has an 
experimental GUI tool that uses expect and extensive reference manuals.

WWW: http://www.itl.nist.gov/div898/software/dataplot.html/