MonoGame

MonoGame is an open source implementation of the Microsoft XNA 4 Framework.

21 Alternatives To MonoGame

Adventure Game Studio

Adventure Game Studio provides the tools to make your own adventure, for free!

Armory3D

Armory 3D is a free and open source game development software developed using Haxe and Kha and made to run inside Blender.

Blacksmith 2D

Black is a highly optimized 2D framework for web, mobile games, and playable ads.

Cocos2d-x and Cocos Creator

Cocos Engine Official Website | Cocos Creator | Cocos2d-x | Open Source Cross-Platform Game Development Engine
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Construct 2

Scirra Construct is a 2D game development engine with a focus on building games visually.
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FlatRedBall

Cross-platofrm 2D game engine using C#, focused on developer productivity, transparency, scalability, and ease of use.

LITIengine

LITIengine is a free and open source Java 2D Game Engine. It provides all the infrastructure to create tile based 2D games with plain java, be it a platformer or a top-down adventure.
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RPG Maker

Make your own PC game with RPG Maker. Our easy to use tools are simple enough for a child, and powerful enough for a developer. Try it free today!

Unity3D

Unity is the ultimate game development platform. Use Unity to build high-quality 3D and 2D games, deploy them across mobile, desktop, VR/AR, consoles or the Web, and connect with loyal and enthusiastic players and customers.
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Unreal Engine

Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.