I have found this product. Thanks Siddigirf.
Cisco ACE 4710 Application Control Engine.
Is there a stand alone product? But 4710 is a product family of 6500 switches and 7600 serie routers.
Cisco's ACE products (now end of life) to my knowledge balancer servers like a Citrix Netscaler if you will. A link balancer will do the same idea but on ISPs. Check out what I mean here: http://www.elfiq.com/otherproducts.
You also get a lot more for your project with Elfiq, namely it has the fail-to-wire capability so it's not a point of failure, which is important because you're looking at business continuity if you don't deploy in H/A.
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BTW, if you're using Cisco routers, OER/PfR feature might be an option.