GeneticAlgorithm

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Google: slime breeder (todo: an find english version, link to the interesting bit in "about this program")
[This] is the same search, but English only.
http://www2j.biglobe.ne.jp/~tatuta/cgi-bin/slme.cgi is the one we want
http://www2j.biglobe.ne.jp/~tatuta/cgi-bin/slme.cgi?mode=guide, starting from "about the dna", is the curious bit
Actually, [this] is possibly more useful, as the lower frame is also English.