I haven't had the time to be a good steward on a number of these packages. Several I picked up when I was much more involved with EPEL, and others when I was just doing lots of ruby. Please feel free to take them over, as I will be orphaning them in pkgdb soon.

rpms/ruby-dbus -- Ruby D-Bus client ( el6 el5 )
rpms/ruby-ldap -- Ruby LDAP libraries ( master f24 f23 f22 epel7 el6 el5 )
rpms/ruby-libvirt -- Ruby bindings for libvirt ( el6 el5 )
rpms/ruby-postgres -- A Ruby interface for the PostgreSQL database engine ( el6 el5 )
rpms/ruby-rpm -- Ruby bindings for RPM ( el6 el5 )
rpms/ruby-shadow -- Ruby bindings for shadow password access ( master f24 f23 f22 epel7 el6 el5 )
rpms/ruby-sqlite3 -- A Ruby interface for the SQLite database engine ( el6 el5 )
rpms/rubygem-ParseTree -- Extracts the parse tree for a class/method and returns an s-expression ( el6 el5 )
rpms/rubygem-RedCloth -- Textile parser for Ruby ( master f24 f23 f22 el6 el5 )
rpms/rubygem-RubyInline -- Write foreign code within your ruby code ( el6 el5 )
rpms/rubygem-ZenTest -- Automated test scaffolding for Ruby ( el6 el5 )
rpms/rubygem-abstract -- Allows you to define an abstract method in Ruby ( el6 el5 )
rpms/rubygem-actionmailer -- Service layer for easy email delivery and testing ( el6 el5 )
rpms/rubygem-actionpack -- Web-flow and rendering framework putting the VC in MVC ( el6 el5 )
rpms/rubygem-actionwebservice -- Web service support for Action Pack ( el6 el5 )
rpms/rubygem-activeldap -- Ruby/ActiveLdap is a object-oriented API to LDAP ( el6 )
rpms/rubygem-activerecord -- Implements the ActiveRecord pattern for ORM ( el6 el5 )
rpms/rubygem-activeresource -- REST modeling framework (part of Rails) ( el6 el5 )
rpms/rubygem-activesupport -- Support and utility classes used by the Rails framework ( el6 el5 )
rpms/rubygem-amqp -- AMQP client implementation in Ruby/EventMachine ( el6 el5 )
rpms/rubygem-archive-tar-minitar -- Provides POSIX tar archive management from Ruby programs ( el6 el5 )
rpms/rubygem-bunny -- Synchronous Ruby AMQP 0.9.1 client ( el6 el5 )
rpms/rubygem-configuration -- Pure Ruby scoped configuration files ( master f24 f23 f22 )
rpms/rubygem-crack -- Really simple JSON and XML parsing, ripped from Merb and Rails ( master f24 f23 f22 el6 el5 )
rpms/rubygem-eventmachine -- Ruby/EventMachine library ( el6 el5 )
rpms/rubygem-extlib -- Support library for DataMapper and Merb ( el6 el5 )
rpms/rubygem-facon -- Tiny mocking library ( master f24 f23 f22 el5 )
rpms/rubygem-fakeweb -- A tool for faking responses to HTTP requests ( master f24 f23 f22 el6 el5 )
rpms/rubygem-flexmock -- Mock object library for ruby ( el5 )
rpms/rubygem-gettext -- RubyGem of Localization Library and Tools for Ruby ( el6 el5 )
rpms/rubygem-gettext_activerecord -- Localization support for ActiveRecord by Ruby-GetText-Package ( el6 el5 )
rpms/rubygem-haml -- An elegant, structured XHTML/XML templating engine ( el6 el5 )
rpms/rubygem-httparty -- Makes HTTP fun! Also, makes consuming restful web services dead easy ( master f24 f23 f22 el5 )
rpms/rubygem-jnunemaker-matchy -- RSpec-esque matchers for use in Test::Unit ( master f24 f23 f22 el6 el5 )
rpms/rubygem-launchy -- Helper class for cross-platform launching of applications ( master f24 f23 f22 )
rpms/rubygem-linode -- Ruby wrapper for the Linode API ( master f24 f23 f22 el6 el5 )
rpms/rubygem-locale -- Pure ruby library which provides basic APIs for localization ( epel7 el6 el5 )
rpms/rubygem-mime-types -- Return the MIME Content-Type for a given filename ( el6 el5 )
rpms/rubygem-moneta -- A unified interface to key/value stores ( el6 el5 )
rpms/rubygem-newgem -- Bundle Ruby libraries into a RubyGem ( el6 el5 )
rpms/rubygem-pkg-config -- A pkg-config implementation by Ruby ( el6 el5 )
rpms/rubygem-rails -- Web-application framework ( el6 el5 )
rpms/rubygem-rcov -- Code coverage analysis tool for Ruby ( el6 el5 )
rpms/rubygem-rspec -- Behaviour driven development (BDD) framework for Ruby ( master f24 f23 f22 epel7 el6 el5 )
rpms/rubygem-ruby-ole -- Ruby OLE library ( master f24 f23 f22 el6 el5 )
rpms/rubygem-ruby2ruby -- Generate pure ruby from RubyParser compatible Sexps ( el6 el5 )
rpms/rubygem-ruby_parser -- A ruby parser written in pure ruby ( el6 el5 )
rpms/rubygem-rubyforge -- A script which automates a limited set of rubyforge operations ( el6 )
rpms/rubygem-sexp_processor -- A branch of ParseTree providing generic sexp processing tools ( el6 el5 )
rpms/rubygem-shotgun -- Automatic reloading version of the rackup command ( master f24 f23 f22 )
rpms/rubygem-simple-rss -- A simple, flexible, extensible, and liberal RSS and Atom reader for Ruby ( master f24 f23 f22 el6 el5 )
rpms/rubygem-snmp -- A Ruby implementation of SNMP (the Simple Network Management Protocol) ( master f24 f23 f22 el6 el5 )
rpms/rubygem-stomp -- Ruby client for the Stomp messaging protocol ( epel7 )
rpms/rubygem-templater -- Ruby framework for building code generators ( el6 el5 )
rpms/rubygem-test-spec -- Behaviour Driven Development interface for Test::Unit ( master f24 f23 f22 )
rpms/rubygem-thor -- Thor is a toolkit for building powerful command-line interfaces ( el6 el5 )
rpms/rubygem-treetop -- A Ruby-based text parsing and interpretation DSL ( master f24 f23 f22 el6 )
rpms/rubygem-uuidtools -- A simple universally unique ID generation library ( el6 el5 )
rpms/rubygem-yard -- Documentation tool for consistent and usable documentation in Ruby ( el6 el5 )