I'm not sure how specific a definition of "plugins" you're asking about. But if by those you mean "other modules that work with Class::DBI", you will want the Class::DBI::Foo module for your DBD driver if one exists (e.g. Class::DBI::Pg, or Class::DBI::SQLite. I would also mention Class::DBI::Loader since it can be quite handy for keeping your scripts clean of package declarations. Beyond that, it depends on what you want to do.