Free good fps games that you can download and online

Like i said if you look in discussion i know a few you can download off sites like:combat arms. warrock but that's all i can remember But if your also looking for a good free but you buy it and pay once at a store you can get ETQW enemy territory quake wars, Halo 1-2 and more just Go to a gamestop,EA games store near you. I hope you like my awnser. =)