The original C.A.T. Content Authoring Tool runs on a javascript/asp engine with a SQL backend. Below, for demonstration purposes, is a flash version of the frontend featuring clickable buttons, dragable toolbars and dialog boxes, as well as areas for entering text. Feel free to click, drag, and type; this should give you a good feel for the C.A.T. user interface.
Place here your alternate content (displayed if Flash Player aren't been detected).
C.A.T. Content Authoring Tool Player (screenshot)
In a nutshell, content developers use the C.A.T. WYSIWYG Editor to easily add text, graphics, sound, and interactions to a lesson, and then the content is run in the C.A.T Player.