moepII supports nice small modules. For example, a module can be an away-system. Just look yourself which modules are available yet:
The list is available on the SourceForge.net filelist (you need to scroll down). The following list might be complete, too:
The FAQ 3.4, 3.5, 3.6, 3.7 provide more information about modules and how to load and write them. If you wrote a module please send it to me :-)