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BUTE Budapest International 24-hour Programming Contest
Annual 24-hour contest hosted by Budapest University of Technology and Economics. The contest is open to a limited number of international teams of 3 people via an internet qualifying round.
http://www.challenge24.org/
C++ Programming Contests
One contest per week for all levels of difficulty.
http://www.cpp-home.com/
Grid Wars
Writing battle programs championship. Sponsored by HP.
http://www.gridwars.com/
MacHack
Annual Macintosh programming contest and convention.
http://www.machack.com/
OpenChallenge
3-monthly challenge. Every three months the innovations are published under GNU GPL/FDL licenses.
http://www.openchallenge.org/
Swiss Olympiad in Informatics
The SOI is a national programming contest for people up to 20 years in age.
http://www.soinf.ch/
Techwoods
Regional Level Programming Olympiad organized by the Madras Christian College, Chennai.
http://www.techwoods.com/