Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.

PTC Mathcad - PTC Mathcad PTC Mathcad is Engineering Math Software That Allows You to Perform, Analyze, and Share Your Most Vital Calculations.

GNU Octave - GNU Octave is a programming language for scientific computing.

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

Maxima - Maxima is a fairly complete computer algebra system written in Lisp with an emphasis on symbolic computation.

EngineeringPaper.xyz - Online app for engineering calculations. Solves systems of equations, checks and converts units automatically, supports plotting, and allows for the creation of a link to share your work. Free and open source, no registration required.