rubyonrails.org site anno 2015
Ruby on Rails stylesheet engine for Sass
CoffeeScript adapter for the Rails asset pipeline. Also adds support for .coffee views.
Rails application preloader
Rack-based asset packaging system
Sprockets Rails integration
Rails observer (removed from core in Rails 4.0)
Connects business objects and REST web services
A virtual machine for Ruby on Rails core development
A gem to automate using jQuery with Rails
Jbuilder: generate JSON objects with a Builder-style DSL
Ruby on Rails unobtrusive scripting adapter for jQuery
Extracting DomAssertions and SelectorAssertions from ActionView.
Protect attributes from mass-assignment in ActiveRecord models.