rake routes

applications_licenses GET    /licenses/applications(.:format) {:action=>"applications", :controller=>"licenses"}
                      GET    /licenses(.:format)              {:action=>"index", :controller=>"licenses"}
                      POST   /licenses(.:format)              {:action=>"create", :controller=>"licenses"}
                      GET    /licenses/new(.:format)          {:action=>"new", :controller=>"licenses"}
                      GET    /licenses/:id/edit(.:format)     {:action=>"edit", :controller=>"licenses"}
                      GET    /licenses/:id(.:format)          {:action=>"show", :controller=>"licenses"}
                      PUT    /licenses/:id(.:format)          {:action=>"update", :controller=>"licenses"}
                      DELETE /licenses/:id(.:format)          {:action=>"destroy", :controller=>"licenses"}

routes.rb

resources :licenses do
   get 'applications', :on => :collection
end