Horos - A free, open source 64-bit DICOM medical image viewer
Unity - The multiplatform game creation tools for everyone.
Weasis - Weasis is a multipurpose standalone and web-based DICOM viewer.
Godot Engine - Feature-packed 2D and 3D open source game engine.
MicroDicom - DICOM viewer. MicroDicom is a free DICOM viewer. Export to the most common picture formats, movie, clipboard. It is equipped with most common tools for manipulation of DICOM images.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.