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Radius is a powerful tag-based template language for Ruby inspired by the template languages used in MovableType and TextPattern. It uses tags similar to XML, but can be used to generate any form of plain text (HTML, e-mail, etc...).
Rails is a framework for building web-application using CGI, FCGI, mod_ruby, or WEBrick on top of either MySQL, PostgreSQL, SQLite, DB2, SQL Server, or Oracle with eRuby- or Builder-based templates.
This gem can compare doms and assert certain elements exists in doms using Nokogiri. .
Rails observer (removed from core in Rails 4.0). ActiveModel::Observer, ActiveRecord::Observer and ActionController::Caching::Sweeper extracted from Rails.
Add a hook like before_filter to your controllers that gets executed between when your action is completed and the template is rendered. It can really DRY up loading some data that is used for views (headers / layouts / etc).
Easy to use Settings helper that loads its data in from config/settings.yml. Handles adding multiple sources, and easy reloading.
Rails internals: application bootup, plugins, generators, and rake tasks. Railties is responsible to glue all frameworks together. Overall, it: * handles all the bootstrapping process for a Rails application; * manager rails command line interface; * provides Rails generators core;
Colorize printed text on ANSI terminals.