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steam
Sure I've got Steam, but I don't play much online :)
Half-Life, Opposing Force, Blue Shift, Counter-Strike, Deathmatch Classic, Team Fortress Classic… I also have an old copy of both SteamDown (the pirate version of Steam, which allows you to play all Steam games online) and Non-SteamDown (which allows you to play all Steam games offline, for example HL2) but I seldom use them. :p