Graphmatica
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Graphmatica is a graphing program created by Keith Hertzer, a graduate of the University of California, Berkeley. It runs on Microsoft Windows.
Graphmatica is distributed free of charge for evaluation purposes. After one month, non-commercial users are asked to pay a $25 licensing fee. Other licensing plans are available for commercial users.
[edit] Capabilities
Graphmatica can graph Cartesian functions, relations, and inequalities, plus polar, parametric and ordinary differential equations.