The best Game Development alternative to Unity is Godot Engine, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Unity and loads of them are Game Development Tools so hopefully you can find a suitable replacement. Other interesting Game Development Tool alternatives to Unity are Unreal Engine, GDevelop, Candlestick and Stride Game Engine.
ezEngine is a free, open source game engine written in C++. Its philosophy is to be modular and flexible, such that it can be adapted to many different use cases. EZ utilizes a plugin system to integrate features such as FMOD or Jolt Physics.
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The Graphics Development Engine for Business and Industry. Build high-quality 3D solutions and deploy to any platform.
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Esenthel is a next gen, cross-platform C++ game engine that comes with a lighting fast, high performance game engine with advanced graphics and physics and support for multiplayer and UNLIMITED size worlds which is make the engine well suit even MMORPG titles.
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The only true complete development platform for online games. HeroEngine seamlessly integrates the entire client and server architecture required to operate an online game directly into the development process.
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MANU is an easy to use Video Game Maker. Making your own 3d arcade games with MANU is easier than ever. No code. No limits.
Multimedia JavaScript framework to create real cross-platform and hybrid game engines, games, emulators, multimedia libraries and apps.
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AppGameKit is a simple cross platform game development tool that runs on Windows, Linux, MacOS and Raspberry Pi. A version to run on Android and iOS is also available. With AppGameKit you can use a simple Basic like programming language to develop cross platform applications, 2D...
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Project Anarchy is a complete end to end game engine and state-of-the-art toolset for mobile. Project Anarchy includes an entirely free license to ship your game on iOS, Android and Tizen platforms.
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GameSalad Creator is an authoring tool developed by GameSalad, Inc. (formerly Gendai Games) aimed primarily at non-programmers for composing games in a drag-and-drop fashion, utilizing visual editors and a behavior-based logic system.
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Leadwerks Game Engine provides the smoothest learning curve to take you from beginner to full-fledged game developer. Use the visual editor and the flowgraph system to set up game interactions without code. Use Lua to write your own game scripts.
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Lumix Engine is an open-source 3D game design software and engine. It's written in C++ and supports several scripting languages.
