In February 2011, I reviewed a new free product on the market for 3D model review named Tekla BIMsight by Tekla, Inc. (Read review) Tekla has recently released the new Tekla BIMsight version 1.3, and the big point is that it is still a free product.
As I mentioned in my first article on the BIMsight software, this is a basic clash detection software that allows you to bring several different 3-D models together for project collaboration and collision detection. While it is not a robust software, it performs clash detection that can meet the needs of many people and that I believe warrants consideration. It is a straight forward software that is not difficult in learning to use and also has a decent forum support system that is easily accessible from within BIMsight.
Applying Technology to Architecture 