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.
Synfig Studio - Just another WordPress site
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Adobe Animate - Adobe Animate is a Flash, vector animation software.