More information: http://archicad.com/
This video presents a demonstration of what Building Information Modeling is about, what it means to work with ARCHICAD. You can see how much time and effort can be saved when working with a true Building Information Modeling authoring tool. This video presents also some intuitive solutions that will make working in ARCHICAD lots of fun.
Free ARCHICAD Download: http://www.graphisoft.com/downloads/