dict

The dictclient plugin requires  Ruby/DICT

Gems

Although  Ruby Gems is not a requirement, it's highly recommended to have it available. Please note that  there are some issues about it.

shorturl

The rubyurl and tinyurl plugins require  shorturl. You can install it via Gem.

tzinfo

The time plugin requires  tzinfo. You can install it via Gem.

rubyful_soup

Older version of the urban dictionary plugin require  rubyful_soup, which you can install via Gem. rubyful_soup is not required anymore since [503]