TopTen Revit Sites
Revit Architecture, Revit Reading Room, Revit OpEd

Products
Artlantis for Revit users, eTransmit, Elevatorarchitec, Sweets

Blogs
BIMscape, Revit Cat, Revittize, What Revit Wants

Companies
CADD Microsystems, IMAGINIT Technologies, Graitec, ProdLib

Reviews
collected by

Reference
ARCAT, Autodesk Revit Books