Apache web server stress test

Hi
I need to a software can test my apache server under high traffic.for example can simulate 1000 user request or more to my server and give me good statistic. I have found this product, but that is not free
If any one know such as this program I will happy for inform that.

Thanks in advance

 

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Google search ?

If you search the net with arguments like

you will quickly find an overview of opensource test tools on http://www.opensourcetesting.org/performance.php