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Godot Engine - Feature-packed 2D and 3D open source game engine.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Frostbite - An integrated clinical practice, education and research institution specializing in treating patients. Account maintained by @MayoClinic/MCSMN.
Unity - The multiplatform game creation tools for everyone.
CryENGINE - The most powerful game development platform is now available to everyone. Full engine source code.