The International Obfuscated C Code Contest A contest to write the most obscure/obfuscated C program. http://www.ioccc.org/

The Robot World Cup Initiative Soccer playing computers. http://www.robocup.org/

Swiss Olympiad in Informatics The SOI is a national programming contest for people up to 20 years in age. http://www.soinf.ch/

RoboCom An online game for programmers. Participants determine how robots will move, communicate with others or even build more robots. http://www.cyty.com/robocom/

Teamwork in Programming Contests 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. http://www.acm.org/crossroads/xrds3-2/progcon.html

Loebner Prize 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. http://www.loebner.net/Prizef/loebner-prize.html

Programmer of the Month A periodical problem solving contest for programmers, originally internal to AT&T, is now open to anyone. http://members.tripod.com/~POTM/

Internet Problem Solving Contest Online programming contest for teams, open to anyone. http://ipsc.ksp.sk/

International Contest for ICCS Programming contest disseminated by the Nalini Foundation in five categories: computation, simulation, graphic patterns, words, mind benders. http://iccs.8m.com/

Internet Programming Contest Duke University sponsors a programming contest that takes place in real-time over the internet. http://www.cs.duke.edu/~ola/ipc.html

Programming Contest Problems Archive If you are preparing for a programming contest, this page might be useful. Includes past problems of national, regional and international contests. http://www.inf.bme.hu/contests/tasks/

MacHack Annual Macintosh programming contest and convention. http://www.machack.com/

Tarleton State University AITP Tarleton Contest Annual programming contest at Tarleton State University. http://www.tarletonaitp.org/contest.htm

ICFP Programming Contest (1999) The webpage for the 1999 ICFP Functional Programming Contest. http://www.cs.virginia.edu/~jks6b/icfp/

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/

TopCoder 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/

Valladolid Programming Competition An online contest with information about writing competitions, questions, and an online judge. http://acm.uva.es/problemset/

JRobots Java-based Robots Programming challenge. http://www.cfxweb.net/~jrobots/

Minigame 8-Bit Coding Competition Create a game for the Commodore 64/128, Spectrum, Amstrad CPC or Atari 8-bit, in just 2048 or 512 bytes of code. http://demo.raww.net/minigame/

Spare-Time Programming Contest This is a casual contest open to any University of California Computer Science student. http://pages.cpsc.ucalgary.ca/~becker/Contest/