1. Companies starting with G:

      G5 Software
      GabitaSoft Entertainment
      Gaijin Entertainment
      Gamalog Media
      Game Agents
      Game Arts
      Game Mill Publishing
      Gamehouse
      Gameinvest
      Gamejump
      GameLab
      GameMill Entertainment
      Gamenauts
      Gamer's Edge
      Games For Loving
      Games4Win
      GameStar
      Gamevil
      Gamma Software
      Ganbarion
      Gas Powered Games
      Gathering Of Developers
      GEnie
      Genki
      Gestalt Games
      Girls Inc.
      Global Game Jam
      Global Star
      Gogii Games
      Gold Star
      Good Deal Games
      Goodtimes Interactive
      Got Game Entertainment
      Gotham Games
      Graftgold
      Gratuitous Games
      Gray Matter Studios
      Gremlin Graphics
      Griptonite Games
      Grolier Electronic Publishing
      Groove Games
      Groove Six Studios
      Grubby Games
      GSC GameWorld
      GSI
      GSP
      Guerrilla

      Note: bolded names indicate companies that released a game within the last twelve months.