what is the best open source website load testing tool? Please share your experience.
Jmeter is good but complex. siege, ab, httperf, openSTA, Microsoft web application stress tool, are all alternatives varying in functionality and complexity
The most advanced free and open source load testing tools are:
JMeter is known to be the most popular one, it has GUI, record-n-replay capabilities, large community, pretty good [official and [URL="http://community.blazemeter.com/knowledgebase"]contributors](http://jmeter.apache.org/usermanual/) documentation.