May be most of you just know it:
http://www.microsoft.com/en-us/download/details.aspx?id=15702
This math calculator is interesting to solve easy calculations on the PC while working with gadgeteer and peripherals … It makes also few graphics on equations. It is free of charge
Ow, it even visualises 3D math. Nice, thanks for the link.
I’ve been looking for something like this. Thanks!
That’s great. Thanks again, Microsoft! Now I just hope my son doesn’t find this or he’ll ever learn a thing… 
Doesn’t like torus formula 
@ Architect - definitely you need Matlab …
I do have it. 
I also like Octave. Just testing capabilities of MS Mathematics.
That Torus looks like some kind of haloween design