Hi,
Check out www.openbim.org and www.graphisoft.com/openbim/ for details on Open BIM.
Google is a great resource!
Marcel
Open Bim is a universal approach to the collaborative design, realization and operation of buildings
It's the initiative of buildingSMART and others.
It's an collaborative design approach
From Building Smart's website:
Open BIM is a universal approach to the collaborative design, realization and operation of buildings based on open standards and workflows. Open BIM is an initiative of buildingSMART and several leading software vendors using the open buildingSMART Data Model.
The Open BIM Programme is a marketing campaign initiated by GRAPHISOFT®, Tekla® and other members of buildingSMART® to urge and facilitate globally coordinated promotion of the Open BIM concept throughout the AEC industry.
-It is important to note that Autodesk is not currently a part of this OpenBIM initiative.