Cafu is an open-source 3D game engine written in C++, designed for multiplayer and real-time 3D action games. It supports advanced rendering, physics, and networking, ideal for FPS or simulations. Cafu targets Windows, macOS, and Linux, with tools for map editing and scripting in Lua. Without a modern visual editor, it suits C++ programmers, with documentation and a small community. Its MIT license ensures no royalties, though 2D support is minimal. Cafu’s focus on multiplayer makes it perfect for developers creating networked 3D games, but its niche status limits adoption. Actively maintained, it offers a lightweight alternative for 3D-focused indie projects.