GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
Matplotlib - matplotlib is a python 2D plotting library which produces publication quality figures in a variety...
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.
DataMelt - DataMelt (DMelt), a free mathematics and data-analysis software for scientists, engineers and students.