A comprehensive bibliography of philosophy maintained, curated and indexed by a community of over six hundred academics. It uses state-of-the-art technology to monitor all online sources of research content in the discipline, including journals, books, personal pages maintained by academics, and open access archives. Its index currently includes over two million books and articles organized into approximately five thousand topics. PhilPapers has over 200,000 registered users and attracts over one million visitors per month. Categories of curated topics include: