40 sites in Contests
RAD Race
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The Rapid Application Development Race is a programming competition open to any kind of development tool and/or language. The RAD Race focuses on real life business and administrative programming and not on algorithm development.
http://www.radrace.org/
TopCoder
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Online computer programming competitions in the Java, C++, and C# languages. Competitions take place twice a week, and members can win from $25-$300. Major tournaments have a prize purse of $250,000.
http://www.topcoder.com/
Forum - Usenet comp.programming.contests
See also
The category Contestsin other languages