15 Open Source Game Engines & Frameworks (2025 Edition)

Completely free and open source 2D and 3D game engine with MIT license.
Perfect for: Indie developers, 2D games, mobile development

Free 2D game engine by King with Lua scripting and cross-platform deployment.
Perfect for: Mobile games, 2D platformers, puzzle games

Open source 2D game framework with C++, JavaScript, and Lua support.
Perfect for: Mobile games, 2D games, cross-platform development

Free 3D game engine with Python and C++ support, originally developed by Disney.
Perfect for: 3D games, simulations, educational projects

Free 2D game framework using Lua scripting language.
Perfect for: Prototyping, 2D games, learning game development

Free HTML5 game framework for web and mobile games using JavaScript.
Perfect for: Web games, mobile web games, browser games

Free cross-platform game framework based on Microsoft's XNA framework.
Perfect for: Cross-platform games, C# developers, desktop games

Free Java game development framework for desktop, mobile, and web.
Perfect for: Java developers, cross-platform games, Android games

Simple and Fast Multimedia Library for C++ with zlib license.
Perfect for: C++ developers, 2D games, multimedia applications

Simple DirectMedia Layer - cross-platform development library for C/C++.
Perfect for: Low-level game development, C/C++ projects, cross-platform games

Free game programming library for C and C++ with zlib license.
Perfect for: 2D games, C/C++ development, educational projects

Simple and easy-to-use library for C/C++ game development.
Perfect for: Learning game development, prototyping, 2D/3D games

Free and open source game engine built with Rust programming language.
Perfect for: Rust developers, modern game development, ECS architecture

Free no-code game engine with visual programming and JavaScript support.
Perfect for: Beginners, rapid prototyping, 2D games

Free 3D game engine integrated with Blender for 3D game development.
Perfect for: 3D games, Blender users, Haxe developers