Knowledge base

I know that the software used by Dreamhost for its superb Knowledge base is internal, but I’d like to know if there is something similar freely available (even less powerful) to create a knowledge base (or faq collection) in a web site.

Thanks to all.

Hey, I can’t vouch for any of these, but there’s a whole area at the PHP Resource Index.

Good luck, if any of them turn out to be really good, post back and let us know.