Sprockets is a Rack-based asset packaging system that concatenates and serves JavaScript, CoffeeScript, CSS, Sass, and SCSS.

Ruby CoffeeScript is a bridge to the JS CoffeeScript compiler.

Uglifier minifies JavaScript files by wrapping UglifyJS to be accessible in Ruby

Render components in views or controller actions. Server-side rendering powered by ExecJS. Transform JSX in the asset pipeline or use Shakapacker.

Parse CSS and add vendor prefixes to CSS rules using values from the Can I Use website.

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

See README.md

A framework for pulling together an overview of data that is important to your team and displaying it easily on TVs around the office. You write a bit of ruby code to gather data from some services and let Smashing handle the rest - displaying that data in a wonderfully simple layout. Built for developers and hackers, Smashing is highly customizable while maintaining humble roots that make it approachable to beginners.

Ruby wrapper around the escodegen JavaScript generator that generates ECMA script from an abstract syntax tree.

Ruby Babel is a bridge to the JS Babel transpiler.

A Railties Gem to compile hbs assets

Terser minifies JavaScript files by wrapping TerserJS to be accessible in Ruby

A drop-in Jekyll Plugin that provides an asset pipeline for JavaScript, CSS, SASS, SCSS. Based around Sprockets (from Rails) and just as powereful it provides everything you need to manage assets in Jekyll.

Compile and evaluate EJS (Embedded JavaScript) templates from Ruby.

A static site generator. Provides dozens of templating languages (Haml, Sass, Compass, Slim, CoffeeScript, and more). Makes minification, compression, cache busting, Yaml data (and more) an easy part of your development cycle.

Rails bindings for opal JS engine

iOS UIAutomation Test Runner

Ruby Eco is a bridge to the official JavaScript Eco compiler.

RSpec matchers for Couch Potato

Netzke helps you build complex web UI in a modular way