Godot Engine – Multi-platform 2D and 3D game engine
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Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
Cocos2d-x is a suite of open-source, cross-platform, game-development tools utilized by millions of developers across the globe. Its core has evolved to serve as the foundation for Cocos Creator 1.x & 2.x.
Luanti (formerly Minetest) is an open source voxel game-creation platform with easy modding and game creation
Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more
A multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West and Death Stranding 2.
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.
Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU
Lightweight and modular C++11 graphics middleware for games and data visualization
A powerful free cross-platform RTS game engine. - Report issues at https://springrts.com/mantis/
3D C++ Game Engine - yet another open source game engine
Improved version of the X-Ray Engine, the game engine used in the world-famous S.T.A.L.K.E.R. game series by GSC Game World. Join OpenXRay! ;)
3D Engine with Blender Integration
Descent 3 by Outrage Entertainment
Community effort to maintain and improve Jedi Academy (SP & MP) + Jedi Outcast (SP only) released by Raven Software
KlayGE is a cross-platform open source game engine with plugin-based architecture.
An open source C++ game engine.
A high speed C++17 Vulkan game engine
Multi Theft Auto is a game engine that turns Grand Theft Auto: San Andreas into networked multiplayer.
Open-source C++ game engine with Lua for 2D and 3D games across mobile, desktop, WebAssembly, and Xbox (UWP).
Godex is a Godot Engine ECS library.
A cross-platform 2D game engine
GemRB is a portable open-source implementation of Bioware’s Infinity Engine.
C++20 framework for creative coding 🎮🎨🎹 / Cross-platform support (Windows, macOS, Linux, and the Web)