Scilab

Picture by  Pixabay

Instructions:

1. Download the latest version at http://www.scilab.org/download/latest
2. Please follow the tutorial available on their website under Resources->Documentation. Here is the direct link to the tutorial http://www.scilab.org/content/download/849/7901/file/Scilab_beginners.pdf

Things you can do in Scilab:

L.out