PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Unity - The multiplatform game creation tools for everyone.
PhotoFlare - Quick, simple but powerful Cross Platform image editor.
Godot Engine - Feature-packed 2D and 3D open source game engine.
PixBuilder - Free Photo Editing Software for PC
Blender - Blender is the open source, cross platform suite of tools for 3D creation.