Canadian Mathematical Society Competitions
Sponsors several mathematics competitions for students including Canadian Open Mathematics Challenge (COMC), the Canadian Mathematical Olympiad (CMO), and it coordinates Canada's participation in the Asian Pacific Mathematics Olympiad (APMO).
camel.math.ca/CMS/Olympiads/index.html
Texas Competitive Mathematics
An information source for coaches and students involved with UIL, TMSCA, and other mathematics, science, and computer science competitions in Texas.
www.texasmath.org