PythonCAD is a scriptable (with the Python language) and easy to use drafting program.

Boat Scenario is a drawing tool. It is your ideal companion for training sessions, rule learning, strategy explanations and more. It lets you make a presentation of a situation, describing the facts as you represent the action.

Your computer has been invaded! Dozens of little viruses are pouring in via security holes in Microsoft Internet Explorer, Microsoft Outlook, Microsoft MSN Messenger and Microsoft Recycle Bin! Using your trusty mouse you must shoot the buggers before they can destroy your files! Some will steal them from their home directories and take them back to their security hole. Others will just eat them right there on the spot! See how long you and your computer can survive the onslaught!