• High-IQ Societies on the Web
• IQ Tests, Puzzles and Resources
• Philosophy Links
• Think Tanks and Consulting Organizations
• Other Links
• Reference

• Thinkers International email discussion group (Hi-IQ membership not required)
  
• Mensa (USA site) 98th percentile
  
• Intertel or Intertel (another, Beta site) 99th percentile
  
• Colloquy 99.5th percentile, email society
  
• International Society for Philosophical Enquiry 99.9th percentile
  
• Triple Nine Society 99.9th percentile
  
• IQuadrivium Society 99.9th percentile
  
• Prometheus Society 99.997th percentile
  
• The Mega Society / Foundation (Site Map) 99.9999th percentile
  

• Uncommonly Difficult IQ Tests (by Darryl Miyaguchi)
  
• Puzz.com (IQ tests, puzzles and games)
  
• Gamepuzzles for the joy of thinking (Kadon Enterprises, Inc.)
  
• Brain.com (includes their 5-minute IQ test and ThinkFast)
  
• Project Renaissance (IQ-enhancing techniques by Dr. Win Wenger)
  
• Online IQ test and Intelligence Profile
  
• Karyn S. Huntting's High IQ World
  

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• Exploring Plato's Dialogues (A Virtual Learning Environment, University of Evansville)
  
• 2think.org (Are you a thinker or a follower?)
  
• Su Tzu's Chinese Philosophy Page
  
• Philosophy News Service
  
• Online Papers in Philosophy
  
• The American Philosophical Association
  
• Noesis: Philosophical Research Online
  
• Internet Encyclopedia of Philosophy
  
• Philosophy Links at Links2Go

• Black Think Tank
  
• The Brookings Institution
  
• Carnegie Endowment for International Peace
  
• The Carter Center
  
• The Cato Institute
  
• Center for Strategic and International Studies
  
• Council for a Livable World
  
• European Policy Centre
  
• Federation of American Scientists
  
• Foreign Policy in Focus
  
• Group for Research and Information on Peace and Security (Belgium)
  
• Independence Institute
  
• Institute for Public Policy Research (UK)
  
• The MASIE Center (Technology and Learning)
  
• RAND

• National Association for Gifted Children
  
• The Sagan Society
  
• The Critical Thinking Community
  
• Bad Science: Examples of science misinformation.
  
• Estimated IQs of the Great Geniuses
  
• Great Thinkers and Visionaries on the Net
  
• Keirsey Temperament and Character Web Site
  

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• Information Please (Almanacs, biography, etc.)
  
• The Electronic Texts Center (University of Virginia)
  
• Corpus of Electronic Texts (Irish texts)
  
• Library of Congress
  
• Gabriel: European National Libraries
  
• Mathematical History Resources (Univ. of St. Andrews, Scotland — includes an extensive list of biographies)
  
• The Newsstand (Online Newspapers from around the World)
  
• International Currency Converter