Perl has a large number of modules (23,500+) designed to help you in developing your application(s), these are hosted on CPAN. There are also many other Perl related projects which have their own sites, here are a few of them.
If you are looking for a list of recommended modules, look at Task::Kensho.
CGI/Web Programming and Administration
Science Related Programming
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Database Programming
Object Oriented ProgrammingGeneral Programming
GUI Toolkits
Graphics Programming
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