Wikicoding – programmer's encyclopedia
wikicoding.org
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What does this intend to be? It seems like a much less mature version of Rosetta Code. http://rosettacode.org/wiki/Rosetta_Code
It's aimed to a better and neater version. It aims to have separate pages for article in each language, which builds on each edit and thus maintains standalone fully compilable (or one that builds successfully) programs.