1. HimlHTML-based Indented Markup Language for Ruby
3. Gem SrcGem.post_install { `git clone gem_source src` }
4. MotorheadA Rails Engine framework that helps safe and rapid feature prototyping
6. RoundaboutA Rails Engine that generates a page transition diagram for your Rails app from request specs
7. RfdRuby on Files & Directories
8. String templateA template engine for Rails, focusing on speed, using Ruby's String interpolation syntax
12. JbA simple and fast JSON API template engine for Ruby on Rails
16. TracerouteA Rake task gem that helps you find the unused routes and controller actions for your Rails 3+ app
18. Stateful enumA very simple state machine plugin built on top of ActiveRecord::Enum
20. Html5 validatorsA gem/plugin for Rails 3, Rails 4, Rails 5, and Rails 6 that enables client-side validation using ActiveModel + HTML5 Form Validation
21. ErdA Rails engine for drawing your app's ER diagram
22. I18n generatorsA pack of Rails generators gem plugin that generates Rails 3 and Rails 2 I18n locale files for almost every known locale.
24. teriyakiAutomatically imports *_path definitions from config/routes.rb for acceptance testing
28. nested layoutsThe only fork of "nested_layouts" Rails plugin in Github that correctly bug fixed for Rails 2.3