Make Elements Rectilinear – Revit app to elements rectilinear. That is: horizontal, vertical, have equal Y points, or have equal X points
Mesh Import from OBJ Files – Revit app to bring meshes (from OBJ files) into Revit
PTS Import – Import laser scan data into AutoCAD which then can be imported into the Revit Family Editor. This video and this video show how to use the app.
Dynamo for Revit
Autodesk Developer Network
Microsoft Developer Network