processing.org - 65 questions, wiki excerpt but no wiki
processing - 427 questions, full wiki
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It would rather be better to change processing.org in processing-language.
processing is being used on questions like Lego Mindstorms: gnu noSuchPortException after severl successful attempts which has nothing to share with Processing.
They should indeed be synonym, but the processing tag needs to be watched closely, as it's highly ambiguous, as Save a specific part of a huge text file (over 2GB) shows; in that case, processing is used for a question about processing a text file.