I have not personally used it, but you should check out Gimlet:
It is a hosted knowledge-base type system written by the folks who wrote
LibStats (who are fellow Code4lib-bers as well).
Jenny Jing wrote:
> Hi, All:
> Our library is searching for a Help Desk software for our reference desk
> (such as LibStats),
> It is also a knowledge based where we could store the FAQs.
Digital Library Software Engineer
Arizona State University Library