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Steve Vinoski of Iona says …
As I noted nearly two years ago in this column, many distributed integration applications, including much of the software running the Web, are based on “middleware dark matter,” which consists of dynamic languages like Python, Perl, and PHP. Not only is this phenomenon still true today but, based on the vast numbers of open-source projects revolving around these languages, it seems to still be rapidly growing. [IEEE Internet Computing: Dark Matter Revisited]
 The earlier column he refers to here is Middleware “dark matter”.