From Ross's Random Stuff:
Geometry Calculator can calculate the area and perimeter of a circle, triangle, rectangle/square, and a regular N-Gon (polygon). It can also calculate the surface are and volume of a sphere, cylinder, rectangular prism/cube, cone, and a pyramid. There is currently no graphical user interface, it's just a console (text interface) program. Version 3 may include unspecified updates, enhancements, or bug fixes.