The big four BIM players include Autodesk Revit, Bentley Microstation, Graphisoft ArchiCAD and Nemetschek Vectorworks Architect.
For CAD formats Autodesk DWG is an industry de facto standard. The less proprietary format DXF is also a universal standard for information exchange. Autodesk’s less popular DWF format also has iOS support among apps. Bentley’s approach to iOS apps is its i-model format. One needs the Bentley desktop applications to create i-models.
We have included some open-standard 3D CAD formats with robust market use and acceptance. These are quite common on the MCAD side but also have use in AEC in limited form. Within this group is listed the IFC 2×3 file format for BIM.
We are going to start with propriatary formats first and then review the most popular open formats below.



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I've dealt with over 120 3D / 2D Vector formats in my time (the Right Hemisphere platform read about this many), you name it, I've had to deal with it. I know them all and hate them all ;-)
For the last 15+ years people have talked about one 3D file format to rule them all. It hasn't happened in MCAD, it hasn't happened in DCC/3D, and it's not going to happen in AEC CAD.
That said, it's good to be aware of the main formats, those that are open and those that are proprietary.
Whether you deal with DWG, DWF, DXF, SKP, IFC, OBJ, 3DM, i-models, or other; this article is useful to you. It's a good overview to the main format supported formats in architectural iOS Apps. It's also part of a good series on iPad Apps for architects
http://architosh.com/2013/03/ultimate-ipad-guide-apps-for-architects/
Let me know any questions you have.