Scilab and ScicosLab are Open Source Math Programs that can be used in various engineering and scientific applications. I use ScicosLab with the Modnum tool box in all my Telecommunications work, but both Scilab/ScicosLab can be used for all the mathematics involved in my CelNav EBook. The video below is a brief introduction of both programs, using the console & editor functions.
Video Introduction
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References
#1. Scilab Open Source Software
https://www.scilab.org
#2. ScicosLab Open Source Software
http://www.scicoslab.org
#3. ScicosLab with Modnum Toolbox
https://www.scicoslab.org