Skoool’s Mathematical Toolkit has three sections: 2D Shape Creation (shown above), Charting and Coordinates and Graphing. First, you determine the grid units, minimum and maximum values, and then create eight different 2D shapes (quad, circle, triangle, line, arc, ray, segment and vector) with the appropriate X,Y points. Here you see two 30 unit radius circles, with centers 10 units offset.
The Charting area lets you chart up to two variables, in this case, list 1 is the number of cousins and list 2 is the number of siblings for each student.
These charts are very quickly created. Here is a bar chart for the number of cousins (list 2).
Click here for more Mathematical applications in the Gallery.