Aspen Plus - Maximize profits using a plant-wide simulation solution that combines unparalleled accuracy and engineering collaboration with time-saving workflows.

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

GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.

SMath Studio - Tiny, powerful, free mathematical program with WYSIWYG editor and complete units of measurements support.

Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.