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Godot Engine - Feature-packed 2D and 3D open source game engine.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Unity - The multiplatform game creation tools for everyone.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.