Blender

See https://www.blender.org/

Description

Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, video editing and 2D animation pipeline.

License: GPL-2.0

Resources

You can find relevant add-ons to blender on the Blender Add-on category page

• There is also a video on 10 essential addons for architectural design that come with Blender 2.81+ by UH Studio description of some add-ins
• Blender for Architects by ETHZ CAAD Youtube playlist course by ETH Zurich - Computer-Aided Architectural Design for Blender version 2.79).
• UH Studio Blender Architecture YouTube channel