Grevit is a free GH plugin which allows you to create BIM models in Grasshopper and export them to AutoCAD and Revit.
Grevit page
a post by Mihai Pruna
A blog on CAE software development created by Mihai Pruna. All opinions belong to Mihai Pruna. Mihai Pruna is an Aerospace Engineer who writes code as a consultant. Find out more at http://progmodcon.com.