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Godot Engine - Feature-packed 2D and 3D open source game engine.
libtwo - All-purpose c++ app prototyping library, focused towards live graphical apps and games
Unity - The multiplatform game creation tools for everyone.
Unigine - Unigine Engine is a proprietary cross-platform middleware, developed by Unigine Corp.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Flutter - Build beautiful native apps in record time 🚀