load testing of web servers

Are there any useful free tools on the market for stress testing our website servers? running IIS. What tools do you use for such purposes, open source or commercial.
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pma111Asked:
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Emmanuel AdebayoGlobal Windows Infrastructure Engineer - ConsultantCommented:
Hi,

What version of IIS are you running, I have used Web Capacity Analysis Tool from Microsoft on IIS6.0

http://technet.microsoft.com/en-gb/magazine/2008.04.utilityspotlight.aspx

I have read in some forums that it works on IIS7 upward as well.

Regard
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pma111Author Commented:
6and 7
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Emmanuel AdebayoGlobal Windows Infrastructure Engineer - ConsultantCommented:
This should be good for you then.

regards
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arober11Commented:
The Apache project offers both:  ab and jmeter.

Either will happily load ANY website irrespective of the web-server flavour.
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Microsoft IIS Web Server

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