The information on the BIM and FM splash page about the Revit/Maximo plugin is incorrect. The tool was actually an IBM led development. The tool isn't dead, it's currently available as part of any enterprise Maximo deployment (7.5+ I believe, but check with IBM) for 'free' (no cost from IBM for the tool, setup will probably cost you real money though). Don't bother contacting Autodesk about it for information, the few folks at ADSK that know the tool even exists will just refer you to IBM.
An alternative tool is ModelStream by Microdesk. Rather than using a COBIe data export from Revit that only goes one way, ModelStream is bidirectional and allows for custom mapping of parameters. ModelStream, however, is not free although the unofficial pricing I have seen is very reasonable for its capabilities.