MATLAB (short for MATrix LABoratory) was invented by Cleve Moler in the 1970's and was upgraded and is now sold by The Mathworks company.
The program performs plotting of functions, matrix manipulations. The software also has an extra option to interface with the Maple software to allow for simplification of easy to complex math functions.
Submit here webpages that explain and illustrate how to use MATLAB.
Sites that cover more than one math software program should be submitted to the Math Software category.