South African Mathematics Olympiad http://ridcully.up.ac.za/samo/
The official national mathematics competition of the country. It is a three round competition with interesting questions and prizes. Site contains background, contest information, past problems, and publications.
The Indian MO-Cell http://144.16.74.145/
The headquarters of all Math olympiad related activity in India. Located at the Department of Mathematics of the Indian Institute of Science, Bangalore. Provides informations on the Indian National Maths Olympiad and past contest problems.