This covers pretty much all of them. You could add Vexon, but they have been very inactive recently. Also, add Socialblade/RPM under Maker. They are not a "gaming network", but they have like 90% gamers. Also, Konsole Kings is sort of a gaming network.Base79 (Leet network)
IGN (Atomic partners)
BentPixels (Vultra)
Fullscreen (Fullscreen Arcade , Yeousch)
Maker (TGS, N4Gtv, JungleNetwork , Union For Gamers)
Machinima (Affiliate , Main , Realm , Respawn)
ZoominTV (ZoominGames)
BroadBandTV (Viso, TGN, Acifin, TNG)
Curse (Main Network)
And I wouldn`t recommend any under Iricom or QuizGroup