>>And let's have some for the engineering side of things
I've been very impressed with Scilab - which when you consider the cost of a MATLAB licence - is amazing software for free
www.scilab.org/
I've been struggling a bit trying to get my Simulink models to run in Scicos - it seems very slow, but, that's probably just me.
I also intend to get beyond the tutorials and really get to grips with this;
www.caelinux.com/CMS/
which again, given the cost of commercial CAD and FE tools is quite amazing.
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