SketchUp - 3D for Everyone
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Autodesk Revit - Autodesk Revit is building information modeling software for architects, structural engineers, MEP engineers, designers, and contractors.
AutoDesk InfraWorks 360 - InfraWorks 360 preliminary engineering and design software provides tools to work on infrastructure projects in a real-world context.
FreeCAD - An open-source parametric 3D modeler
Innovyze Micro Drainage - MicroDrainage enables engineers, developers, hydrologists and approving authorities to design and audit drainage systems