FINAL CUT - Library for creating terminal applications with text-based widgets
Unity - The multiplatform game creation tools for everyone.
termbox - Termbox is a library that helps making terminal-based pseudo-GUIs.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Slang - Slang is a powerful visual programming language using a newly developed stream-based paradigm.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.