GameSalad

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Unity

Cocos2d is an open-source software frameworks for building cross-platform games and apps.

Godot is a free and open-source 2D and 3D, cross-platform, game engine released under the MIT license. With Godot, you can develop games using Go or GDScript. Godot provides a huge set of common tools for game production, so that you can focus on making your game without reinventing the wheel. The development environment runs on multiple operating systems including Linux, macOS, and Windows and can compile games for PC, Mobile and the web browser.

Cocos Creator is a script development, entity-component and data-driven game development tool focused on content creation. It comes with an easy-to-follow content production workflow and a powerful suite of developer tools for game logic and high-performance game creation.

The Unreal Engine is a game engine and suite of tools and technologies developed by Epic Games. The engine was first released in 1998 as a part of the first-person shooter game Unreal, where the game itself was built on the engine. Today the Unreal Engine has grown into an ecosystem that includes a marketplace for game assets that can help indie developer to develop games and make a living selling game assets them selves. The Unreal Engine is free to use and provides a revenue-share model for developers and has been used to tipple A studios and indie developers to create games in almost every genre, including platformers, fighting games,RPGs, MMORPGs, and many more.

Godot is a free and open-source 2D and 3D, cross-platform, game engine released under the MIT license. With Godot, you can develop games using Go or GDScript. Godot provides a huge set of common tools for game production, so that you can focus on making your game without reinventing the wheel. The development environment runs on multiple operating systems including Linux, macOS, and Windows and can compile games for PC, Mobile and the web browser.

CryEngine is an commercial open-source game engine designed and developed by the German game developer Crytek. With CryEngine, game creators can achieve their goals faster by building games on an already proven game engine that provides its full source code. The engine is provided with no up-front cost, only a royalty percentage of 5% of the gross receipt, which makes it perfect for game developers and teams with a low budget or funding. Surrounding the project is a large community and a market place filled with user-made game assets that can be used to increase the speed-to-market.