Graphmatica

Is a powerful, easy-to-use, equation plotter with numerical and calculus features:

Win32 screen shot.

Graph Cartesian functions, relations, and inequalities, plus polar, parametric, and ordinary differential equations.

Up to 999 graphs on screen at once.

New data plotting and curve-fitting features.

Numerically solve and graphically display tangent lines and integrals.

Find critical points, solutions to equations, and intersections between Cartesian functions.

Print your graphs or copy to clipboard as bitmap or enhanced metafile in black-and-white or color.

On-line help and demo files make getting up to speed a snap.