DDG is mostly a front end for a bunch of search engines. Perl, PHP and Python are great to make front-ends like that. Because you are for the most part only dis

DDG is mostly a front end for a bunch of search engines. Perl, PHP and Python are great to make front-ends like that. Because you are for the most part only dispatching queries, parsing xml feeds and build the gui for the end user. Writing an internet scale search engine on the other hand would require different tools. Most successful projects has probably been done i C, C++ and maybe Java.