Unity - The multiplatform game creation tools for everyone.
Enscape3D - Realtime Rendering Plugin for Revit. Live link from BIM to virtual walkthrough.
Godot Engine - Feature-packed 2D and 3D open source game engine.
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.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
WIZZCAD - WIZZCAD is the first Open BIM-based platform for the digital transformation of all your construction projects.