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Iw (Linux)
Jabber
Jahshaka
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Jcode.pl
Jekyll
Jekyll (software)Jetty
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JitsiJMax
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Jq (プログラミング言語)
JRuby
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JSDocJuK
JuKJython
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K-MeleonK3b
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KaffeKaffeine
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Kate
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KaTeXKBabel
KCharSelect