GMT Games
GMT Games is a California-based wargaming publisher founded in 1990. The current management and creative team includes Tony Curtis, Rodger MacGowan, Mark Simonitch, and Andy Lewis. The company has become well known for graphically attractive games that range from "monster games", of many maps and counters, to quite simple games suitable for introducing new players to wargaming. They also produce card games and family games. "The Washington Post" called GMT "the modern hobby's highest-profile wargame publisher".
Megagame
An organisation called Chestnut Lodge Wargame Group, based in South London, ran games similar to modern megagames throughout the late 1970s, but the first game ran that was called a megagame was "Memphis Mangler" in April 1982. The game, written by Griffith, was a Vietnam wargame with about 30 players. Megagames were popularised in gaming communities by a video of the first run of the "Watch The Skies" megagame in May 2014.