Top Open Source Alternatives To Unity

Armory3D is an open-source 3D game engine focused on portability, minimal footprint, and performance, with full Blender integration.

Castle Game Engine is a free, open-source game engine for 3D and 2D games, with cross-platform support and a focus on Pascal programming.

Cocos Creator is a game development platform that offers tools for creating 2D and 3D games, and interactive experiences across multiple platforms.

Defold is a free, open-source game engine that allows developers to create and publish games for multiple platforms using a single codebase.

Fyrox is a free and open-source game engine written in Rust, offering a set of tools for creating 2D and 3D games with high performance.

GB Studio is a free and easy-to-use retro game creator for making Game Boy-style games with no programming knowledge required.