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.
Pencil2D - Pencil2D is an opensource animation/drawing software for Mac OS X, Windows, and Linux, based on old...
Godot Engine - Feature-packed 2D and 3D open source game engine.
Adobe Animate - Adobe Animate is a Flash, vector animation software.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.