BIM projects and large portfolio owners, some Autodesk® Revit® users have successfully employed an elegantly simple Revit plug-in that uses Building Information Model Extensible Markup Language (BIMXML) to assist data sharing.
BIMXML employs a plug-in that capitalizes on the data cap- tured in the Revit model and allows further lifecycle data management. Data generated from the start of a project is made available throughout the design, estimating, construction, commissioning, operations, and maintenance phases. It uses accepted and proven Big Data management standards and processes.
The Revit ONUMA plug-in employs BIMXML to improve Revit data sharing. The BIMXML plug-in allows projects to be imported to and from Onuma. The plug-in also allows Revit models to be loaded with meaningful data and basic geometry from SketchUp, ArchiCAD, Bentley products, ArcGIS, Google Earth, and other software com- patible with basic Extensible Markup Language (XML) standard code. The BIMXML plug-in to Revit and other programs comes with ONUMA System web-based software, Onuma Editor Pro and Studio Pro. Student versions are available for free.
There's more information on Onuma and Revit here.
Credit: This post includes excerpts from the AUGIWorld September 2011 article "Revit Plug-in Allows BIG Data Sharing" by Bob Smith, PhD, and Michael Bordenaro