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Problemset archive and online judge accepting solutions in C, C++, Pascal, Java, Python, Ocaml, Prolog and other languages.

Swiss Championship in Informatics 2004 - Der Schweizer Informatik-Wettbewerb für Jugendliche. The SOI is a national programming contest for people up to 20 years in age.

International Obfuscated C Code Contest. A contest to write the most obscure/obfuscated C program.

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.