Ruby on Rails
A Relational Algebra
Ruby on Rails unobtrusive scripting adapter.
Rack-based asset packaging system
XML parameters parser for Action Pack (removed from core in Rails 4.0)
Benchmark and profile your Rails apps
Ruby CoffeeScript Compiler
Static page caching for Action Pack (removed from core in Rails 4.0)
Action caching for Action Pack (removed from core in Rails 4.0)
Jbuilder: generate JSON objects with a Builder-style DSL
Ruby on Rails unobtrusive scripting adapter for jQuery
A gem to automate using jQuery with Rails
Connects business objects and REST web services
Extracting DomAssertions and SelectorAssertions from ActionView.
Rails application preloader
rubyonrails.org site anno 2015
A virtual machine for Ruby on Rails core development
Active Record's Session Store extracted from Rails
Brings back `assigns` and `assert_template` to your Rails tests
PJAX integration for Rails
Add RJS, Prototype, and Scriptaculous helpers to Rails 3.1+ apps
Taint and required checking for Action Pack and enforcement in Active Model
Rails Console on the Browser.
Sprockets Rails integration