Dr. Hanley's Science Graphs (Popularity: ): Software for graphing equations and data. Supports multiple curves as well as parametric graphs. Plus version can graph multi-color contour lines. GrafEq (Popularity: ): Program for graphing implicit relations. Designed for high school use, Windows and Mac evaluation versions available for download. HandyGraph (Popularity: ): Provides a convenient method to create and edit grids, blank graphs, and number lines within Microsoft Word. Free downloadable demo, Windows and Mac versions available. DataFit (Popularity: ): Curve fitting and data plotting software. Accuracy of nonlinear regression results verified with NIST. 3D Grapher (Popularity: ): Plotting and data visualization programming for graphing and animating 2D and 3D equations and table charts. Allows some customization. Pacific Tech Graphing Calculator (Popularity: ): Symbolic and numeric methods for visualizing two and three dimensional mathematical objects. Supports differential equations and integration. Available for Macintosh and Windows. Graphmatica (Popularity: ): Equation plotter featuring symbolic differentiation and tangent lines. Graphs can be printed, copied to the clipboard, and saved as BMP or WMF files. Shareware. IGOR Pro (Popularity: ): An interactive environment for experimentation with scientific and engineering data and for the production of publication-quality graphs and page layouts using Macintosh and Windows computers. Plane Graphic Calculator (Popularity: ): Java applet that can interactively plot the graph of mathematical functions. Handles complex numbers, vectors, and parametric equations. MathGV (Popularity: ): Mathematical function graphing software program for Windows. It can plot 2 dimensional, polar, and 3 dimension functions. Freeware. Autograph (Popularity: ): PC software for teaching calculus, coordinate geometry, statistics and probability.