MATLAB
MATLAB is the numeric and graphics foundation for all The MathWorks products. It is an integrated technical computing environment that combines numeric computation, 2-D and 3-D graphics, and a high-level programming language in a single, easy-to-use environment. MATLAB Toolboxes are libraries of MATLAB functions that customize MATLAB for solving particular classes of problems. SIMULINK (a MathWorks product) is a system for nonlinear simulation that combines a block-diagram interface and "live" simulation capabilities with the core numeric, graphics, and language functionality of MATLAB.
For more information please visit the MATLAB web site.