What about 5 6 7?

I am assuming the 4e is the TSR version from the early 90s. What happened to 5e (Alternity), 6e (D20), Omega World (Polyhedron), and the current 7e (Wizards)? Is this site just dedicated to those GW that were before Alternity?

This site is for TSR(pre-5e) Gamma World. Talk about other edition of Gamma World(and other RPGs) is allowed but not recommended and must stay in other forums(such as General Gamma World or Other RPGs). Gamma World 5e is, IIRC, just a campaign setting, not a game.