Edit advanced mathematical graphs, even with custom functions, using Graph
Graph is a free program letting you create mathematical graphs easily. The interface is simple and pleasant.
Graph supports even parametric, tangent and polar functions along with trendlines, relations, etc., but it lets you create custom constants and functions.
You can zoom, customize the interface (colors and fonts), and more. Note that the program is able to save your graphs as images or even as PDF documents.
