The best open source alternative to CRYENGINE is Godot Engine. If that doesn't suit you, our users have ranked more than 50 alternatives to CRYENGINE and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to CRYENGINE are GDevelop, Redot Engine, Stride Game Engine and Armory 3D.
Godot Engine is a feature-packed, cross-platform game engine to create 2D and 3D games from a unified interface. It provides a comprehensive set of common tools, so that users can focus on making games without having to reinvent the wheel.
GDevelop is an open-source game making software designed to be used by everyone. Any kind of 2D games can be created with it and no programming skills are required to get started. Logic of games are made using visual events.
Redot Engine is a feature-packed, cross-platform fork of the Godot game engine to create 2D and 3D games from a unified interface. It provides a comprehensive set of common tools, so that users can focus on making games without having to reinvent the wheel.
Stride (formerly Xenko) is an open-source C# game engine designed for the future of gaming. It comes with a full toolchain and is especially well suited to create realistic games but allows you much more!.
Armory is an open-source 3D game engine with full Blender integration, turning it into a complete game development tool. The result is a unified workflow from start to finish, making you work faster. No more jumping between different applications.
A refreshingly simple data-driven game engine built in Rust. Free and Open Source Forever!
microStudio is a free game engine online. Create games, learn programming, play, share, prototype and jam!.
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations.
One framework for creating powerful cross-platform games. The spiritual successor to XNA with 1000's of titles shipped across desktop, mobile, and console platforms. MonoGame is a fully managed .NET open source game framework without any black boxes.
Urho3D is a lightweight, cross-platform rendering and game engine implemented in C++ and released under the MIT license. Greatly inspired by OGRE and Horde3D.
The Godot Android Build Environment is a companion app for the Godot Android Editor that provides a build environment to perform Gradle builds when running natively on an Android device.
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Very high quality and easy to use