Tools for Ajax load testing

Question

There seems to be a lot of stress/load testing tool that support AJAX.
I am wondering how well does these tool implemented.

Do they only record http request and repl

Answer 1

All load testers would support AJAX- they're just additional http connections.

There are a few free ones out there- Jmeter, BadBoy, Grinder that all do it well.

All of them have some sort of support for recording/playback, but that's not always what you're looking for.

Easiest way I've done it is to record a sample session, replace a few params with variables and loop it off of a csv or excel file.

Great starting point: video of a google presentation on open source testing.

Edit: updated video link.