Free IFC Exporter for Revit 2014 from Autodesk

"The IFC exporter for Revit 2014 and Revit LT 2014 contains up-to-date improvements on the default IFC export capabilities of Revit contributed by Autodesk and our Open Source contributors. While this app is not necessary for IFC support, it is recommended that users that depend on the quality of their IFC export download this app and keep it up-to-date, as new enhancements and defect fixes are added."

This free add-in may be downloaded from the Autodesk Exchange | Apps website.