Well, AGS came to me in an acid induced dream, in which I, while sitting in the desert eating peyote with Jim Morrison, had a revelation, and I wandered to the nearest internet oasis, upon where AGS was presented to me, engraved upon the golden scrolls of Moroni.
Actually, I can't remember how I found it; probably some abandonware site had a link; I've been using AGS for years now. The first version I had was in DOS, though. ROOMEDIT....