Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
AutoCAD MEP - AutoCAD MEP software helps you draft, design, and document building systems.
DataCAD - DataCAD is a computer-aided design and drafting software for 2D and 3D architectural design and drafting
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
iConstruct - iConstruct is a business information modeling (BIM) software for Autodesk Navisworks, suitable for a large range of industries worldwide.