Unity - The multiplatform game creation tools for everyone.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Godot Engine - Feature-packed 2D and 3D open source game engine.
music21 - Music21 is a Python-based toolkit for computer-aided musicology.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
DaCapo Editor - DaCapo Editor is a free Open Source music sheet editor which allows to easily create nice looking partitions. It is available as a web application as well as a desktop application for Windows, MacOS and Linux.