IFC for Rhinoceros
VisualARQ is a fully-integrated Rhino plug-in that adds architectural features to Rhinoceros. VisualARQ adds parametric 3D architectural objects like walls, beams, columns, doors, windows, and stairs that are suitable for both 3D modeling and 2D documentation.
Starting from 1.2 version VisualARQ exports Rhino models as well as VisualARQ architectural objects to IFC 2x3 files.
See more at http://www.visualarq.com