Autodesk Revit Structure 2016
Revit is the best and most popular BIM software in the world. In Autodesk Revit Structure 2016 the focus is on functionality for structural engineers and for structural designs. New aspects in Revit Structure 2016 include validation of forces, rebar image presentations and placement, and improving the local coordinate system.
When you purchase a licence for Autodesk Revit 2018, you also have the right to use the structure version. This is the only way, in the new licensing structure, to "buy" Revit Structure 2016 (further information on licensing).