Scilab 5.5.2 is another free open source alternative to Matlab (Early today I've filed a bug report concerning to Freemat, another one).
You can download Scilab from
It seems to install just fine, but it fails to start with the error message
"The application has failed to start because Normaliz.dll was not found. Reinstalling the application may fix the problem"
Normaliz.dll consist of a few functions, related to unicode conversions. React OS indeed has an implementation, but it was dissabled in MSVC build just to fix the build!
Please fix this in the correct way... because with this hack the versions of ReactOS compiled with MSVC and GCC have different libraries!
(I cannot do it myself since I don't have MSVC
Just in case it helps, Wine also has an implementation of this library