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.
LabPlot - LabPlot is a KDE-application for interactive graphing and analysis of scientific data.
timeplotters - Timeplotters are command-line tools for visualizing temporal data, especially useful for...
Matplotlib - matplotlib is a python 2D plotting library which produces publication quality figures in a variety...
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.