My name is ATP and I'm modding Grand Theft Auto since 2006 now. I started early with creating SCM (aka CLEO) scripts, you can find the result of that in my download section.
Another big project I am working on is Grand Theft Auto United. The target of this modification is it to convert the cities Liberty City, wich whe know from GTA III, and Vice City, wich we know from GTA Vice City, to the engine of Grand Theft Auto San Andreas. My main task on this modification is it to create the script for the game, wich means shops, races, side missions and so on. But I also work on the map of GTA United, so I fix buildings and a add a lot of new stuff like interiors and exteriors of shops, bars and similar locations. The latest version Grand Theft Auto United is version 1.2. You can get details and of course the download here.