The knowledgebase can be downloaded at http://sourceforge.net/projects/knowledgebase/
The knowledgebase is a tool to help you build a knowledgebase. The knowledgebase is organized into various topics. Users ask questions pertaining to certain topics. The questions/answers are browsable by keywords. The data is stored in a relational database - MySQL. You need to have Apache with PHP3 and MySQL to use this tool.
Different users have different privileges. Certain users can only ask questions and browse answers. Some can answer questions. The administrators can delete irrelevant questions, assign privileges to users etc. (normal admin functions).
The tool is available under the GNU Public License. (GPL)