Updated on November 18, 2016: moved SimLab OBJ Exporter under the Autodesk App Store grouping.
From the Autodesk App Store and the Simlab website:
Simulation Lab Software
Since Simlab Soft was founded in 2007, it's mission was clearly defined: Develop state-of-the-art 3D software products that are both fun and easy to use.
SimLab does its best to make sure that it always provides the right 3D tools, and that the users are enjoying our tools, and they help them succeed, accomplish great results fast, and within budget.
On the Autodesk App Store
SimLab Composer Integration
Transfer and Link Autodesk® Revit® files to SimLab Composer | Free
SimLab FBX Exporter
Export Autodesk® Revit® files into FBX files within Revit | Trial | 99.00 / 299.00 USD
SimLab Collada Exporter
Export Autodesk® Revit® files into Collada files within Revit | Trial | 99.00 / 299.00 USD
SimLab OBJ Exporter
Export Revit models as OBJ (Wevafront) files (*.obj) | Trial | 99.00 / 299.00 USD
SimLab PDF Exporter
Export Autodesk® Revit® files into 3D PDF files within Revit | Trial | 199.00 / 399.00 USD
Export Revit models as SketchUp files (*.skp) readable by SketchUp 8 and newer | Trial | 99.00 / 299.00 USD
On the Simlab Website
SimLab Android / iPad Exporter
Export Revit models in *.zim file format. These files are readable by SimLab free application SimLab CAD Viewer for iPad/ iPhone and Android | Trial | 99.00 / 299.00 USD
There's more information available on the Simlab website.