Unity - The multiplatform game creation tools for everyone.
CSSCO - VSCO Filters with CSS
Godot Engine - Feature-packed 2D and 3D open source game engine.
Clips by Fly Labs - The simplest mobile video editor in the world
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
CSSGram - Recreate Instagram filters with CSS filters and blend mode