Autodesk Autocad 2011 -64-bit- |top| -

AutoCAD 2011 marked the third iteration of the Ribbon (introduced in 2009). By 2011, the Ribbon was fully customizable and context-sensitive. In the 64-bit version, switching between "2D Drafting," "3D Modeling," and "Annotation" workspaces was instantaneous—no stuttering or redraw lag.