If you have ever wanted to generate space group diagrams that are found in the International Tables of Crystallography (vol A). There is a simple free program called Space Group (Mac, Windows, Linux) created by George Lisensky. The program operates in the orthorhombic and monoclinic crystal systems and can generate equivalent positions, centering, glides, screws, mirrors, etc…

The program could be helpful in preparing diagrams and as a teaching tool.

space group How to make Space Group Diagrams