UDK

Unreal Engine 3 is a complete game development framework that operates across 10 platforms. Provides a vast array of core technologies to creating high-quality games and applications.

19 Alternatives To UDK

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AppGameKit

AppGameKit is a game development platform for mobile devices.

Cocos2d-x and Cocos Creator

Cocos Engine Official Website | Cocos Creator | Cocos2d-x | Open Source Cross-Platform Game Development Engine
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Corona SDK

Cross-platform mobile app development.

Duality

A 2D game development framework.
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FlatRedBall

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

GDevelop

GDevelop is an open-source game making software designed to be used by everyone.

Game Editor

Game Editor is the open source game design software that gives you the power to create the games of…

JMonkeyEngine

What is jMonkeyEngine? It’s a free, open source game engine, made especially for Java game developers who want to create 3D games using modern technology.

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.

MonoGame

MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
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OGRE3D

OGRE3D is a scene-oriented, 3D engine written in C++ that is designed to help developers produce application utilizing hardware-accelerated 3D graphics.

Orx

Orx - a portable open source game engine
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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.

Unreal Engine Official Tutorials

Complete resources for learning to use Unreal Engine 4
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Urho3D

Urho3D is a lightweight, cross-platform rendering and game engine implemented in C++ and released…

Wave

Wave makes it easy to be your own boss.