Soccer playing computers.

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.

Problemset archive, online judge and contest hosting service accepting solutions in C, C++, Pascal, Java and other languages.

A unique annual contest in which a winner is selected from participants who comes to the closest to demonstrating that machines can think like humans, as per the Turing Test.

An online contest with information about writing competitions, questions, and an online judge.

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.

A series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.

A contest to write the most obscure/obfuscated C program.

Online programming contest for teams, open to anyone.

Tips and observations from a team of programmers who have regularly won in the ACM programming contests. Published in ACM Crossroads, the student magazine of the ACM.