Valve

Valve is an American video game developer and digital distribution company. Valve has created numerous popular games, such as Half-Life, Counter-Strike, Portal, Day of Defeat, Team Fortress, Left 4 Dead and the Dota 2 series. Valve also owns and operates Steam, it’s online distribution service, where gamers can easily buy, play, share, modify, and build communities around Valve products as well as titles from other independent game studios.