The XYZ GeoBench for experimental geometric computation. The XYZ GeoBench (eXperimental geometrY Zurich) is a workbench for geometric computation on Macintosh computers. It provides an interactive user interface similar to a drawing program which can be used to create and manipulate geometric objects such as points, line segments, polygons, etc. Furthermore the user interface provides convenient access with algorithm animation to the XYZ Program Library that contains many standard algorithms for 2-d problems, several for restricted 3-d problems, and one for d-dimensional computational geometry.