slimanimation - to make stick figure or hand drawn animations
Godot Engine - Feature-packed 2D and 3D open source game engine.
Brush Ninja - Hand-drawn Animated Gif Creator
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Pencil2D - Pencil2D is an opensource animation/drawing software for Mac OS X, Windows, and Linux, based on old...
Unity - The multiplatform game creation tools for everyone.