Sofa QandA is a premium WordPress community theme from ThemeForest designed for Q and A (questions and answers) aka knowledge base website. It has built-in voting system, internal bookmarking (user favorites), user Reputation handler, personalized profile page for each user, Questions sharing on Twitter and Facebook, a couple of ready-made Widgets for spicing up the content and more.
Front-end Questions posting
Front-end Questions edit
Built-in voting system
Internal bookmarking system
User Reputation handler
Personalizable user profile page
Built-in Twitter and Facebook sharing for each new Question