Smart Support
infinetSoftware Smart Support is a knowledgebase and ticket system for customer relationship management. The knowledgebase reduces support requests by answering common questions. The ticket system makes handling customer support more efficient.

phpMyAnswers
phpMyAnswers is a question and answer script to build your own niche content site similar to Yahoo! Answers. The script allows you to import from Yahoo! Answers, is search engine friendly, and makes monetizing with AdSense as simple as entering your publisher ID into the settings page.