Server Load balancing!!

Hello Friends,
I need to balance the load on server which is Linux server having load avg of 4-5 in last two months.
We have two such servers on Linux and one newly perchased on freeBsd...
Can anyone please tell me how to start with ?How do I utilise all the three to share load ...
My client also says that it is good if we don't need a load balancer device separately such as CISCO's load balancer.
So I need to share load on servers 3 in number among themsleves without using a separate device,out of the three two are Linux and one is FreeBsd.

 

 

 

 

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