What you said is absolutely incorrect. There aren't any (as of yet, some are / may be in developement) traditional mods, but many servers run things like RPG mod, Deathmatch mod, Zombie mod, Gun-Game mod, Warcraft mod, Superhero mod (dunno if there is one for CS:S), etc. While only some of these change models, weapons, etc, they all alter gameplay to the point where they are refered to as mods.
If you played CSS at all you would of course already know this...
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