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GDevelop

Unity is a cross-platform game engine and development platform created by Unity Technologies. With Unity game developers can build high-quality 3D and 2D games, deploy them across mobile, desktop, consoles, VR/AR or the Web. Unity was first released as OS X-exclusive game engine but as of 2018 the engine had been extended to support more than 25 platforms.

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.

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Stencyl is a game development tool that allows you to create 2D video games for iPhone, iPad, Android, Windows, Mac, Linux & HTML5 games. The drag-and-drop gameplay designer provided by Stencyl allow you to design and devlop games without writing any code. Stencyl also makes it easy to add your game to the App Store, Google Play and Steam allowing you take money from game purchaces on in-game currency.