O-Matrix (Harmonic Software)

O-Matrix if a full-featured interactive mathematical package for Windows machines that can run both Matlab scripts and functions. In addition, it is said to be up to 10 times faster than Matlab. Its list of features include matrix operations, statistics, optimization, calculus, and even wavelets. As one might guess, it includes extensive plotting capabilities, and one can even create a graphical interface with it. A free version is available on-line.