GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
kSar : a sar grapher - ksar is a sar graphing tool that can graph for now linux,mac and solaris sar output.
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
timeplotters - Timeplotters are command-line tools for visualizing temporal data, especially useful for...
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
Grapher - Put Grapher’s powerful graphing and data analysis features to the test and better understand your data. Learn about features and download a free trial.