Renee is the super-friendly Rack based web framework.

Middleman is a static site generator based on Sinatra. Providing 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.

Build Awesome JavaScript MVC Applications

A project which offers the same Todo application implemented using MV* concepts in most of the popular JavaScript MV* frameworks of today.

Nice comparison. Basically concludes that Ember is a more complete solution, but may not be as performant for large apps, and is opinionated.

Chaplin is an example architecture for JavaScript applications using the Backbone.js library. The code is derived from moviepilot.com, a large single-page application.

D3 allows you to bind arbitrary data to a Document Object Model (DOM), and then apply data-driven transformations to the document.