Mathematical graphing tool for Windows with calculus features

ZigZag is a mathematical graphing tool for Windows.
Features:
Supported graph types:
1. Y(x);
2. X(y);
3. graphs of tables;
4. R(a) - in polar coordinates;
5. X(t) and Y(t) - parametrical equations;
You can specify color, style and width of lines for each graph. You can also change additional properties of graphs depending on graph type (e.g. amount of plotting points, plotting intervals, etc);
The amount of graphs in one document is limited only by the amount of the free memory;

Calculus features:
1. analytical derivation;
2. numerical integration;
3. obtaining equations of tangents and normals.
Lots of design parameters of a coordinate plane (parameters of axes, grid, background, legend);
You can place custom text labels and points on the coordinate plane;
Coefficients on axes;
You can copy graphs as BMP to export them to the Word documents and save graphs as BMP;

New features: obtaining equations of tangents and normals, function calculator, value table.