Toribash
I'd definitely recommend Urban Terror. It's free and very easy on the system requirements too.
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I recomend

Digital paintball 2. awsome free game, mostly capture the flag. uses quake 3 engine I think.

and Quake live, free fun browser based FPS (you play it in your browser).

I have an acc there and play it every now and then. it's a fun game too.
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