The best open source alternative to Unity is Godot Engine. If that doesn't suit you, our users have ranked more than 100 alternatives to Unity and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Unity are GDevelop, Candlestick, Stride Game Engine and GABE.
Platinum Arts Sandbox Free 3D Game Maker is an open source free game maker, free RPG Maker, free sidescroller maker, free Machinima creator, and game design tool that makes it easy for kids and adults to create video games, maps and worlds.
Nau Engine is a versatile and free game engine built on open-source principles. It's designed to be accessible to developers of all skill levels, enabling the creation of a wide range of interactive experiences.
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Write JavaScript 2D and 3D games, compile to native. Create, play, and publish from your terminal.
Maratis is a portable, simple and visual game development tool designed for artists and developers.
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Monkey is a modular language. You can create your own custom modules and use other people's - including the awesome box2d and minib3d modules!.
The RPG Toolkit is a free, open source project delivering a simple, flexible and powerful tool for the creation of role-playing games on your personal computer.
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Wintermute Engine Development Kit is a set of tools for creating and running graphical “point&click” adventure games, both traditional 2D ones and modern 2.5D games (3D characters on 2D backgrounds).
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UrhoSharp is a lightweight Game Engine suitable for using with C# and F# to create games and 3D applications. The game engine is available as a portable class library, allowing your game code to be written once and shared across all platforms.
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Reality Factory is a program that - in conjunction with other tools - allows you to create 1st and 3rd person perspective games without programming! Reality Factory is built on top of the powerful Genesis3D Open Source engine and supports all major 3D graphics cards.
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A free software game engine focusing on developing games faster, more modular and stable with true -1 day portability support.
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