Wolfram Mathematica:

It is one integrated system that delivers unprecedented workflow, coherence, reliability, and innovation. Rather than different toolkits for different jobs, Mathematica has been built ground-up for more than 20 years to deliver one vision: the ultimate technical application and environment.

If you're doing anything technical, think Mathematica--not just for computation, but for modeling, simulation, visualization, development, documentation, and deployment.

Mathematica 7 includes over 500 new functions and 12 additional application areas, all seamlessly integrated in one system.

•   Features:
          ►  Built-in Digital Image Processing & Analysis
          ►  Visualization & Graphics
          ►  Mathematics & Algorithms
          ►  Computable Data
          ►  Data Manipulation
          ►  Core Language
          ►  Interface & User Experience