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The latest version of ruby-processing contains toxiclibs and jbox2d examples which are now both available as rubygems 'toxiclibs' and 'pbox2d'. The 'toxiclibs' gem is a wrapper for the java library, and corresponds approximately to the yet to be be released "0021" version (by Karsten Schmidt). The 'pbox2d' gem borrows from but is different to Dan Schiffmans Box2D-for-Processing (it is built as a jruby extension).