I just find KnowledgebasePublisher (2.0 BETA1) released. It can be put into a LAMP (Linux+Apache+MySQL+PHP) platform to run it. After looking at the demo site and some live sites that use it, I also want to give it a try.
KnowledgebasePublisher is an opensource knowledge base software, FAQ software, or just content manager about any other type of article that you want to publish on your website. It’s so easy to use that you can be managing knowledgebase on your website right from your own web browser.