Wick Editor - The Internet's free and open-source creation toolkit.
Unity - The multiplatform game creation tools for everyone.
AnimationMaker - Create animated presentations and export them to a video file, animated gif or HTML based on SVG...
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.