OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Grit Game Engine - The Grit Game Engine is an MIT-Licensed Open Source Game Engine that is highly scriptable via Lua.
Adobe Animate - Adobe Animate is a Flash, vector animation software.
Lumix Engine - Open source 3D game designer and engine written in C++.
Pencil2D - Pencil2D is an opensource animation/drawing software for Mac OS X, Windows, and Linux, based on old...
MOS - Lightweight game engine.