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GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
Unity - The multiplatform game creation tools for everyone.
XMLStarlet - XMLStarlet Command Line XML Toolkit
Godot Engine - Feature-packed 2D and 3D open source game engine.
xmllint - command line XML tool
Blender - Blender is the open source, cross platform suite of tools for 3D creation.