the following content comes from the awesome 🕶awesome-opal page by Michał Kalbarczyk

Awesome Opal

Opal

Opal Website
Opal Github Repository
Opal Github Organization
Opal Gitter
Opal Stackoverflow
Opalist The only Opal mailing list, issues on the web here
Google Opal Group

Blogs

Funkworks (tagged Opal) Software blog, articles tagged opal
Mikamai (tagged Opal) Software blog, articles tagged opal
Opalist Blog links on the bottom

Video Presentations

Opal A New Hope by Forrest Chang, RubyConf 2013 - Broad overview of Opal and reasons to adopt, with strong Star Wars theme, rerecorded to include full sound at beginning, video picks up on Youtube. If switching video sources is too much of a pain, whole thing w/censored out sound here
Opal: The Journey From JavaScript to Ruby by Bozhidar Batsov eurucamp 2015 -

Frameworks

Clearwater - Component-based Ruby front-end framework
Glimmer DSL for Opal - Pure-Ruby Web GUI and Auto-Webifier of Glimmer Desktop Apps
Hyperstack - A Complete Isomorphic Ruby Framework using React, Rails and Opal
Inesita - Frontend web application framework in Ruby using Opal.
Lissio - lissio is a VCL (Vai Col Lissio) framework for Opal to implement frontends completely on the client side.
Opal Ferro - Create webapps object-oriented style. No HTML, just beautiful and simple Ruby code
Opal Praha - An opal-vienna rewrite with Convention over Configuration in mind
Snabberb - A minimalistic reactive frontend web framework written in Ruby / Opal and based on Snabbdom.
Vienna - Client-side MVC framework for Opal
Volt - A Ruby web framework where your Ruby runs on both server and client

Gems

Dare - Ruby Web Game library on top of Opal
Electron Opal - Lightweigt Ruby wrapper around the geat electron desktop application engine
Grand Central - State-management and action-dispatching for Opal apps
Hyalite - This is ruby virtual DOM implementation using opal. It is inspired by react.js.
Jekyll Opal - Let Jekyll convert your Ruby into JavaScript using Opal
Negasonic - Music live coding in the browser, powered by Tone.rb
Opal ActionCable - Opal wrapper for rails actioncable
Opal ActionPack - A small port of the awesome action pack to Opal JS
Opal ActiveRecord - An basic implementation of rails active record for use with opaljs
Opal ActiveSupport - The port of the glorious ActiveSupport for Opal
Opal Async - Non-blocking tasks and enumerators for Opal.
Opal Browser - Browser support for Opal.
Opal Builder - An attempt at making the builder XML gem work with Opal
Opal Dom - Simple DOM for Opal (legacy?)
Opal Eventable - Eventable module for Opal
Opal Events - An Events Plugin for Opal
Opal Factory Girl - Get Factory Girl working on Opal (sans ActiveRecord support). Still a work in progress.
Opal Haml - Opal + Haml = <3
Opal Handlebars - Experimental handlebars parser/generator for opal.
Opal IRB - IRB (interactive ruby) for Opal
Opal Mikado - An Opal library for working with Mikado graphs.
Opal Minitest - Minitest, now for Opal!
Opal Models - Client side modelling with Opal
Opal Music - create music tunes with ruby in the browser
Opal Native - React Native in Ruby
Opal Observer - KVO style observers for Opal
Opal Overwolf - Overwolf support for Opal.
Opal RSpec - opal + rspec = <3
Opal Rails - Bringing Ruby to Rails · Rails bindings for Opal
Opal Router - Router implementation for Opal (very alpha)
Opal Scriptish - Scriptish support for Ruby scripting, with Opal.
Opal Shimmer - Shimmer is an application state and configuration management library built with Opal
Opal Slim - Sprockets integration to compile Slim templates for Opal apps
Opal Sprockets - Integration with Sprockets
Opal Starter Kit - Create Opal projects easily
Opal UI - A GUI Toolkit in your Browser
Opal aasm - Opal compatible version of Acts As State Machine with React.rb awareness
Rack Opal - Rack middleware to automatically compile ruby scripts to javascripts
Reactive Record - Ruby Opal + React + ActiveRecord = GOODNESS!
YASL - A pure Ruby serialization library alternative to YAML that works in Opal inside web browsers

JS Wrappers (Bindings)

Opal Airbrake - Opal wrapper for airbrake-js javascript library.
Opal Dagred3 - An opalized (ruby-fied) wrapper for the dagreD3 directed, acyclic graphing library
Opal Firebase - Firebase Wrapper providing a nice ruby syntax
Opal Highcharts - Ruby wrapper for Highcharts and Highstock javascript libraries
Opal I18next - Ruby wrapper for the i18next javascript library
Opal JQuery - jQuery for Opal
Opal Knockout - opal-knockout is wrapper of knockout.js for Ruby(Opal)
Opal Phaser - A fast and free Opal wrapper for the Phaser framework to develop browser-based games in Ruby!
Opal Phoenix - Opal wrapper for Phoenix Framework javascript library
Opal Pixi - Ruby wrapper for the Pixi.js graphical library
Opal Polymer - A starting point for building web applications with Polymer
Opal Processing - ruby-processing for the web, powered by Processing.js and Opal
Opal PunchDB - An Opal bridge to PouchDB
Opal Pusher - Opal bindings for the Pusher JS API
Opal Raphael - Opal binding for Raphael.js
Opal Sid - Hermit jsSID wrapper for opal
Opal VirtualDOM - virtual-dom wrapper for opal
Opal Web Midi - Web MIDI wrapper for Opal.
Reactrb - Opal Ruby wrapper of React.js library.
Stripe Opal - Stripe.JS wrapper for Opal
Three.rb - An Opal wrapper for Three.js to develop 3D browser applications in Ruby!
Tone.rb - Ruby wrapper for Tone.js

Examples

Asciidoctor.js - A JavaScript port of Asciidoctor produced by Opal
AsciifyMe - Convert webcam into asciiart. Live!
Calculator - A HTML5 shared calculator app using ruby Opal
Codemotion - Ruby-everywhere chat app (rack/websockets/opal)
Glimmer Calculator - A fully functional calculator with keyboard shortcuts and multiple themes built in Glimmer
Inesid - SID Web player with retor interface
Inesita DBMonster - DBMonster test app written in Inesita
Inesita Playground - Playground for Inesita
Inesita TodoMVC - Inesita TodoMVC
Negasonic Editor - Online editor for Negasonic, music live coding in the browser
Opal Blog - An example of using the Clearwater framework with Opal/Rails
Opal Canvas Demo - Crappy canvas experiment using Opal.
Opal Cats - Get some cat pictures, with Opal
Opal Conway - Conway Game of Life, implemented with Opal and Ruby
Opal Examples - Experiments with html5 and the opal ruby to javascript compiler
Opal Node server with Express.js and Socket.io Demo Chat App - Project which uses Opal (Ruby) with a Node.js server, Express and Socket.io to build a real time chat
Opal HelloWorld - A simple project to test OpalRb
Opal IRB - IRB (interactive ruby) for Opal
Opal Learning WebGL - Opal (Ruby) port of the Learning WebGL (NeHe) demos
Opal On Node Example - My first Socket.IO chat
Opal Phaser Examples - Phaser usage examples converted to opal-phaser in order to see how to make Phaser based games the Ruby way.
Opal Pixi Examples - Examples using the opal-pixi gem
Opal Play - Playing around with emberjs and opaljs to run ruby code in the browser
Opal Playground - Opal Playground (Improved, layout, opal-irb integration, opal-browser, lissio, reactive-ruby library support).
Opal Playground - Opal Playground (Original)
Opal Playground - Experimenting with opal to write CSS, JS, and the DOM with Ruby
Opal Pong - Pong in Opal
Opal Raw - A very fast opal setup - no sprockets! - includes opal browser - uses guard to automatically compile your .js.rb files as you save them
Opal Robots - RRobots in the browser
Opal Snake - Snake in Opal
Opal Static Example - Ruby Opal static example
Opal TODOS - Simple static todo app using OpalRb
Opal TODOS - todomvc based opal example
Opal Tic Tac Toe - A very simple port of TodoMVC
Opal on Angularities - Write AngularJS app in Ruby using Opal.
Opal try
Opal with slim sass sprockets - Opal environment with sprockets, slim, sass, and rails-assets.
Opalrb Example - A "todo" example using the Opal.rb Project.
Pong Opal Phaser - Pong game written in opal-phaser
Rack Opal - Really simple example of Opal with Rack.
Rails Opal React Example - JS is hell of shit! Opal is rising!
RethinkDB Ruby Opal - A RethinkDB demo application built with Ruby and Opal
Roda Opal Example - Example of Using Roda with Opal
Sprint Poker - Online estimation tool for Agile teams
WebAdudio Playground - Website to play with web-audio
Zupfnoter - A feature rich abc based music editor written in Opal Ruby; uses dropbox, abc2svg, jspdf and much more

Other

Dyndoc Opal - dyndoc js via opal
Ember Cli Opalrb - Include Opal.rb in your Ember projects
Ferro - Demonstration of the abilities and use of the opal-ferro framework
Gulp Opal - A gulp plugin to convert Ruby to Javascript (by Opal)
Meteor Opal - Meteor support for Opal, the Ruby to Javascript Compiler
Opal Benchmarks - A quick, totally inaccurate set of simple benchmarks for opal
Opal Console - A Chrome extension to compile and run Opal in the browser
Opal Loader - Opal Ruby module loader for webpack
Opal Meteor - Ruby runtime and core library for Meteor
Opal Node Runtime - Opal runtime as a Node module
Opal Node Compiler - Opal compiler as a Node module
Opal npm Wrapper - Npm wrapper for Opal
opal.tmbundle - TextMate bundler for Opal Ruby

Live Applications

Deprecated

Contribution

Your contributions and suggestions are welcome ♡.