2013:
IFC Exporter 2013 (v2.15.1):
http://apps.exchange.autodesk.com/RVT/Detail/Index?id=appstore.exchange.autodesk.com%3aifcexporterforrevit%3aen
IFC Export Alternate UI for Revit 2013 (v1.13):
http://apps.exchange.autodesk.com/RVT/Detail/Index?id=appstore.exchange.autodesk.com%3arevitifcexportalternateui%3aen
2014:
IFC Exporter 2014 (v3.7.1):
http://apps.exchange.autodesk.com/RVT/Detail/Index?id=appstore.exchange.autodesk.com%3aifcexporterforrevit2014%3aen
IFC Export Alternate UI for Revit 2014 (v2.5):
http://apps.exchange.autodesk.com/RVT/Detail/Index?id=appstore.exchange.autodesk.com%3arevitifcexportalternateui2014%3aen
via email