Robobat Extension for Revit tries to announce at least one new extension release a month. Novembers offering is the reinforcement of pile caps extension.
The module will create 3D “intelligent” rebar data in Revit Structure, and is available to download at http://www.extensions4revit.com/
The base (free) version will allow the user to define reinforcement for a pile cap of rectangular cross section; the enhanced version will incorporate additional cross section shapes.
I'm in the process of harvesting all this good stuff so that when I get around to learning how to and producing reinforced concrete details I've got it handy.