wrk can be used for simple http benchmarking. It can generate a significant amount of load. You can find it under https://github.com/wg/wrk
A simple call looks like this:
wrk -t12 -c400 -d30s http://www.lvh.me:8080
This will call the page for 30 seconds with 12 threads and 400 open connections. Afterwords you get statistical output...