Blender - Blender is the open source, cross platform suite of tools for 3D creation.
FreeCAD - An open-source parametric 3D modeler
AutoCAD MEP - AutoCAD MEP software helps you draft, design, and document building systems.
SolidWorks - Dassault Systèmes SolidWorks Corp. develops and markets 3D CAD design software, analysis software, and product data management software. SolidWorks is the leading supplier of 3D CAD product design engineering software.
DataCAD - DataCAD is a computer-aided design and drafting software for 2D and 3D architectural design and drafting
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.