bootstrap-sass is a Sass-powered version of Bootstrap 3, ready to drop right into your Sass powered applications.

twitter-bootstrap-rails project integrates Bootstrap CSS toolkit for Rails 7, 6, 5, 4.x (also supports) Asset Pipeline

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web. http://getbootstrap.com

Semantic UI, converted to Sass and ready to drop into Rails, Compass, or Sprockets.

Stylish is a theming toolkit based on semantic-ui

A lightweight CSS framework for developing mobile-first projects in Ruby on Rails.

twitter-bootswatch-rails gem integrates TWBS Bootstrap for Rails Asset Pipeline with less-rails

FontAwesome toolkit for twitter-bootswatch-rails gem for Rails Asset Pipeline with less-rails

twitter-bootswatch-rails-helpers gem provides common view helpers for use with the twitter-bootswatch-rails & less-rails gems