Vvvv - vvvv is a graphical programming environment for easy prototyping and development.
Unity - The multiplatform game creation tools for everyone.
Processing - C++ and Java programming at the speed of thought.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Context Free - Context Free is a program that generates images from written instructions called a grammar.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.