Links to pages on recreational mathematics
Mathematical Competitions
Bulgarian competitions in mathematics and informatics
  (Maintained by Petar Kenderov and Emil Kelevedzhiev)
Canadian Mathematics Competitions
  (Maintained by R. Matinowski)
International Mathematical Olympiads and much more
American Mathematics Competitions (AMC)
USA Mathematical Olympiad
Asian Pacific Mathematical Olympiad
International Mathematical Olympiad
Richard P. Stanley's problem solving course
USC High School Math Contest 1995
  (Maintained by David Sumner)
USC High School Math Contest 1998
  (Maintained by David Sumner)
Putnam Archive
Journals
Quantum
Mathematical Mayhem
  (University of Toronto)
Mat 007 I News
  (University of Toronto)
Math Horizon
  (MAA)
Useful links
Mathematics Oriented high School Servers
  (University of Florida)
MAA Online
 
The Math Forum, Students Center
  (Swarthmore)
Math & Science Gateway, Educational and curricular resources
  (Cornell)
Manipula Math with Java
Mathematics Enrichment
  (University of Cambridge)
Young Mathematicians Network
Mathematics archives: Sites dedicated to teaching of mathematics