FreeCAD - An open-source parametric 3D modeler
AutoCAD MEP - AutoCAD MEP software helps you draft, design, and document building systems.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
DataCAD - DataCAD is a computer-aided design and drafting software for 2D and 3D architectural design and drafting
Onshape - Onshape is the first full-cloud 3D CAD system. It runs in a web browser and on any mobile device.
AutoCAD Arch - Design and document more efficiently with the AutoCAD Architecture toolset, created specifically for architects.