MTA:SA

It extends Rockstar North’s Grand Theft Auto series by injecting code that runs alongside the original game without modifying its files. The extension provides a networking layer, a new graphical interface, and a Lua‑based scripting system, allowing servers to host custom game modes and resources for dozens to hundreds of players.

The platform is self‑hostable and open‑source under GPL‑3.0, offering a sandbox‑style core that can be expanded with scripts, maps, models, and other assets packaged as “resources.” Server administrators can manage access to these resources through user‑rights controls, and the client synchronizes the scripts and assets automatically.

It targets players who want multiplayer experiences such as role‑play, races, deathmatches, or custom modes, as well as developers who wish to create and share new gameplay content within a community‑driven ecosystem.