Ruby: www.ruby-lang.org

Active Record—Object-relation mapping put on rails: api.rubyonrails.org/files/vendor/rails/activerecord/README.html

Martin Fowler on Active Record: www.martinfowler.com/eaaCatalog/activeRecord.html

SOAP4R: dev.ctor.org/soap4r

WEBrick: www.webrick.org

Builder: builder.rubyforge.org