Qustion about load balancers

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http://serverfault.com – I'm using a lot of load balancers in my workplace and I was wondering if there is a good open source one? By good I mean one that can be used in an enterprise, and also is it efficient to use that software with regular PC? BTW, I've been searching the internet a lot and found a few but not sure which one is better than the other one, I need your expertise. (HowTos)