Civil 3D Add-ons!
Civil 3D Add-ons will offer the same coverage that you've become used to here on Revit Add-ons, but for AutoCAD Civil 3D and related products like AutoCAD Map 3D, AutoCAD Utility Designer, and Infraworks 360.
If, like me, you use both Revit and Civil 3D, I hope that you'll join me on Civil 3D Add-ons for coverage of applications that extend Autodesk's line of infrastructure products.
It will take quite some time for me to whip Civil 3D Add-ons into a comprehensive resource, but I hope that you'll be patient while I do.
The URL for Civil 3D Add-ons is: http://www.c3daddons.com/.