Try ILNumerics: We have a rel. long history as open source project and recently changed to commercial licenses for better and reliable support. I am biased but here comes a short feature list:
- Better memory management, hence ...
- Much faster algorithms
- Uses MKL for linear algebra
- n-dim array classes, syntax similar to Matlab
- 3D plot controls
- Support for 32/64 bit
- Support for mono
- Full feature list
