XGAP 4 - a graphical user interface for GAP4

Together with Frank Celler I have written a GAP package called XGAP, which provides the GAP language with a graphical user interface and offers a few applications using this interface. You can for example display the Hasse diagram of a lattice of subgroups of a given group.

See XGAP's homepage for details. You can download XGAP from there or you can directly grab the archive from xgap-4.23.tar.gz. Here is the README file.