http://www.macnn.com/articles/03/09/23/ch.control/
Ch Control System Toolkit available for OS X
updated 03:50 pm EDT, Tue September 23, 2003
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SoftIntegration today released for Mac OS X. Ch is a superset of C interpreter for scripting, 2D/3D plotting, numerical computing, shell programming and embedded scripting. Ch Control System Toolkit is designed for modeling, design, and analysis of continuous-time or discrete-time linear time invariant (LTI) control systems. Version 2.0 adds the Web-based control and analysis functions. It is free for academic use and costs $300 for commercial or personal use.
