Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Revizto - Revizto is an integrated BIM collaboration software platform that gives owners, designers, contractors, and facility managers the essential tools to streamline the building design and permitting process.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Fonn - Fonn is a cloud-based solution designed to increase productivity and profitability on construction sites.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Enscape3D - Realtime Rendering Plugin for Revit. Live link from BIM to virtual walkthrough.