I'm looking for a load test program that I can feed URLs culled from my
logs. I'd like to load test with realistic URLs and be able to crank up
the load (number of simultaneous requests) to judge the capacity of my
servers.

I found a page that describes a large number of load testing tools,
http://www.softwareqatest.com/qatweb1.html#LOAD. I'd appreciate any
suggestions based on experience. I'd prefer to use something that
doesn't cost anything.

Thanks,
Jim