Open Directory Project (also known as ODP or Dmoz) is the largest and most complete directory of the Web. To date, more than four million sites were catalogued in over 590,000 categories, maintained by a group of about 65,000 publishers specialized volunteers who continue to explore the Net and keep up to date database exists. Open Directory is the true revolution in the world of cataloguing of Web resources, and data collected are now used by all the major search engines Network. http://dmoz.org/