active_model_serializers by rails-api
ActiveModel::Serializer implementation and Rails hooks
created at Dec. 1, 2011, 6:39 a.m.
slim by slim-template
Slim is a template language whose goal is to reduce the syntax to the essential parts without becoming cryptic.
created at Sept. 13, 2010, 1:32 a.m.
rest-client by rest-client
Simple HTTP and REST client for Ruby, inspired by microframework syntax for specifying actions.
created at Dec. 7, 2009, 7:34 p.m.
formtastic by formtastic
A Rails form builder plugin with semantically rich and accessible markup.
created at April 7, 2008, 11:18 a.m.
colorls by athityakumar
A Ruby gem that beautifies the terminal's ls command, with color and font-awesome icons. 
created at June 29, 2017, 4:41 p.m.
delayed_job by collectiveidea
Database based asynchronous priority queue system -- Extracted from Shopify
created at Sept. 13, 2008, 2:27 p.m.
simplecov by simplecov-ruby
Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites
created at Aug. 15, 2010, 3:28 p.m.
active_merchant by activemerchant
Active Merchant is a simple payment abstraction library extracted from Shopify. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
created at May 20, 2008, 1:53 p.m.
mechanize by sparklemotion
Mechanize is a ruby library that makes automated web interaction easy.
created at April 18, 2008, 4:55 p.m.