ioquake3

ioquake3 is a free, open‑source engine that implements the gameplay and graphics of Quake 3: Arena and Quake 3: Team Arena. It runs on macOS, Windows, and Linux and is distributed under the GPL‑2 license. The project maintains the original code base while fixing bugs and adding modest enhancements to keep the engine functional on modern systems.

Users can run the original Quake 3 titles, install community‑created mods, or host multiplayer servers using the provided sysadmin guide. The engine also serves as a foundation for developers who want to build new first‑person shooters, offering the full source code on GitHub for modification and redistribution.

The community around ioquake3 contributes updates, documentation, and support through forums and social platforms. It is a stable, actively maintained platform for both players and developers interested in classic FPS experiences or creating derivative games.