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 CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Microsoft Power BI - BI visualization and reporting for desktop, web or mobile
Graphing Calculator - Visualize equations and functions in 2D, 3D and 4D.