ZigZag is a mathematical graphing tool for Windows.
It can plot Cartesian (Y(x) and X(y)), polar, parametric and also
table-defined graphs. The calculus features are obtaining
derivatives, equations of tangents and normals, numerical integration.
Graphs, coordinate plane axes, coordinate space may be fully
customized in ZigZag. You can comment your graphs. ZigZag allows
you to export and copy your graphs as pictures.