One of the best and most comprehensive GTA: San Andreas modifications out there has gone open source starting today. The Multi Theft Auto mod team today announced it, noting that they are taking this more seriously than putting up undocumented source code.

As the name implies, the mod adds full multiplayer network play functionality to several of Rockstar’s famous action games where multiplayer was originally absent. It was started back in 2003 as an experimental piece of C++ software and grew from there. Players can create their own custom maps and gamemodes, as well as game-specific functions and go online to duke it out.