Free load-balancer for fail-over clustering

Please suggest free java-based load balancer for fail-over clustering. It should understand that http server down and route requests to another server. When server up again - it should include them into rotation.
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If u r using tomcat it includes one, refer to this article:

It is usually a componet of ur Application server or servlet Engine.
what is urs to provide more help?
maximkrAuthor Commented:
Yes, I know that each server generally has own load-balancing. We develops cross-paltform application that supports Tomcat, Jetty, JRun, Weblogic, WebSphere, Resin, etc and its difficult to describe cluster configuration for each server.

I know load-balancer from jetty, but it can't understand that server is down.
I don't think a general purpose load balancer like that is free, all my search i didn't found such, usually such Product is not cheap as they know that they are selling this to Enterprises ;-)
Mayank SAssociate Director - Product EngineeringCommented:
Director 5.1 is probably in release now. Its open-source.

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maximkrAuthor Commented:
Thank you, I checked Director 5.1 and some other systems and understand that we need additionally following:
- Windows native (not Cygwin) support or Java
- Standalone (not just plugin to IIS/Apache/etc).
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