Graphmatica (16-bit) is an interactive algebraic equation grapher that can be used to plot mathematical curves. You can graph, scale, size, save and print a wide variety of equation types, including parametric, cartesian, quadratic, trigonometric, polar coordinate, differential and logarithmic. The features include: the ability to display up to 25 graphs on the screen at once, zoom, four levels of detail for graph paper, grid lines, the ability to save setup and lists of equations, and annotation of legends, titles and text. You can export graph images to WMF or BMP format.