• AllExperts
    Web's oldest question and answer site. Operated by
    Semantic Q&A search by - Also see: Wiki Answers
  • Ask a Librarian
    Online reference service from the Library of Congress.
  • Chegg Study
    Active community providing online tutoring and answers to academic questions. - Subscription Required
  • eHow
    Database of how-to articles and videos.
  • Quora
    Popular question and answer site offering high quality answers on many topics.
  • Stack Exchange
    Stack Exchange is a network of communities that are created and run by experts.
  • wikiHow
    Collaborative, wiki-based how-to manuals.
  • Yahoo! Answers
    Web's leading community-powered question and answer site.