First you must watch this tutorial video
It is really helpful.
For the download click here: http://www.scilab.org/download/latest
Something that makes sense to me, is that MathLab and SciLab are kind of similar programs that could help programers to do their stuff.
For me it’s just a really great program that works for programers like wolfram alpha. It is really helpful for any numeric analysis, create matrix, vectors, etc.
The spanish manual for Scilab it’s on this link.
Thank you, and see you next time.