HelpWorks Professional is a robust knowledge base support system written in PHP and MySQL. It is simple to use, packed with power, and offers many powerful features and options which you can customize to meet your needs. Categorize your questions and add as many questions under each category as you like. Let users post their comments on each question. Attach files to each knowledge base question. Backup your answer by attaching a screenshot, code snippet, documentation, or any other type of file. Comes with one year of free upgrades.