Steven Choy lists in this new blog posting some of the more popular PHP offerings for creating and managing FAQ systems.
The following are three PHP scripts for creating and maintaining web-based Frequently Asked Questions (FAQs) systems. They are all free of charge and can use MySQL as database in the backend. I also try to google them to see if there are any example websites that make a good use of them.
The three he mentions are:
He briefly describes each, noting a few of the sites that use each under them. He doesn't really recommend one over the other, however - again a "right tool for the right job" situation. Each has its own strengths that can play well with what your needs might be.