Downloadable tools that help you prepare teaching materials (crosswrords, bingos, etc.):

TEACHERS PET  -  http://www.teachers-pet.org/

HOT POTATOES -  http://hotpot.uvic.ca/

Links to other Authoring Tools: (Kasia Karlak, IOU)

Puzzlemaker

Markin and TexToys

Quandary