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/

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/

PHP Coding  
   A new contest every few weeks. PHP only, but HTML and any extension commonly available to PHP is allowed. Disallowed is any other type of scripting language.
   http://codewalkers.com/php-contest.php

2002 MiniGame Compo  
   Aim is to write a game in 1024 bytes of code, for an 8-bit home computer such as the Atari 2600, NES, CPC+, or TI99/4A. Includes competition news and details of entries.
   http://www.cling.gu.se/~cl3polof/minigame/

Grid Wars  
   Writing battle programs championship. Sponsored by HP.
   http://www.gridwars.com/

C++ Programming Contests  
   One contest per week for all levels of difficulty.
   http://contests.cpp-home.com/

OpenChallenge  
   3-monthly challenge. Every three months the innovations are published under GNU GPL/FDL licenses.
   http://www.openchallenge.org/

RoShamBo Programming Competition  
   A Rock-Paper-Scissors programming competition.
   http://www.cs.ualberta.ca/~darse/rsbpc.html

Programming Tournament from MSO Worldwide  
   Mind Puzzle programming competition from Mind Sports Worldwide.
   http://www.msoworld.com/programming.html

ICFP Functional Programming Contest  
   A contenst sponsored by the International Conference on Functional Programming.
   http://www.ai.mit.edu/extra/icfp-contest/

C++ Robots  
   C++ based robots programming challenge.
   http://www.gamerz.net/~c++robots/

Upstate Collegiate Programming Contest  
   Programming contest for students of Upstate New York colleges and universities.
   http://www.cs.geneseo.edu/projects/ucpc/ucpc.html

Al Zimmermann's Programming Contests  
   A series of programming contests that offer cash prizes. Any programming language may be used. These contests are conducted at irregular intervals, generally once or twice a year.
   http://members.aol.com/bitzenbeitz/Contests/

Prolog Programming Contest  
   General information and contest results about this international programming contest.
   http://www.cs.kuleuven.ac.be/~bmd/PrologProgrammingContests/

BCS Programming Competition  
   The British Computer Society's programming competition, open to teams of up to 5 entrants, students or professionals, aged under 30.
   http://www1.bcs.org.uk/portal/showSection.asp?sectionid=932

The 1KB 6502 Programming Contest  
   Contest programming on the 6502 microprocessor. Valid programs must run on the 1 KB ram Microtan65.
   http://oric.ifrance.com/oric/microtan/6502contest.html

URCSC Computer Programming Contest  
   Programming contest sponsored by the University of Richmond, Computer Science Club.
   http://www.mathcs.richmond.edu/~urcsc/contest/

MiniGame Compo  
   Contest to write a fully playable game in under 1K or 4K. Open to games for classic 8-bit computers.
   http://www.ffd2.com/minigame/

RAD Race  
   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/

Denison Programming Contest  
   The Mathematics and Computer Science Department at Denison University hosts a programming contest each spring for small colleges.
   http://staging.denison.edu/~feil/spring_contest/dspc.html

International InfoMATRIX Computer Project Competition  
   Participants have to create a project for any of the categories (Programming, Design and Use of Computer, Desktop Publishing, Computer Art) First of all, each school must select one representant.
   http://www.infomatrix.ro/

DSAP  
   Data Structures + Algorithms = Programs. Algorithm materials and programming problems from informatics contests.
   http://vnco.lubox.net/

ADHOC - Advanced Developers Hands-On Conference  
   The annual programming contest and conference formerly known as MacHack, this event is put on by Macintosh Developers and for Macintosh Developers. July 21-24, 2004.
   http://www.adhocconference.com

IAUM-CCC  
   Information for Islamic Azad University of Mashad Collegiate Coding Challege that takes place April-May Annually.
   http://www.iaumccc.com/info/

iDevGames : uDevGame Contest  
   An annual event that promotes game development on the Macintosh computer.
   http://www.idevgames.com/

ICFP Programming Contest  
   Annual programming contest held in conjunction with International Conference on Functional Programming. Accepts submissions written using any programming language.
   http://www.cis.upenn.edu/proj/plclub/contest/

Sphere Online Judge  
   Problemset archive and online judge accepting solutions in C, C++, Pascal, Java, Python, Ocaml, Prolog and other languages.
   http://spoj.sphere.pl

Project Euler  
   A series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.
   http://mathschallenge.net/index.php?section=project

Programmer Of The Moment (POTM)  
   Programming contest offers a challenge every few months for C/C++/Perl/Shell/PHP/etc. gurus from around the world. Active Forum and several years of old problems. Restarted September 2004.
   http://dinsights.com/POTM/

JRobots  
   Java-based Robots Programming challenge.
   http://jrobots.sourceforge.net/

OpenECG Programming Contest  
   A programming contest for Electrocardiography record handling applications and tools, using the SCP-ECG Standard.
   http://www.openecg.net/