SassMeister | The Sass Playground!

SassMeister is a playground for Sass. Add some Sass and SassMeister will show you the rendered CSS. SassMeister supports both Sass and SCSS syntaxes, all output styles, and a growing number of Compass extensions and Sass libraries. Current extensions are: Blend Modes, Bourbon, Breakpoint, Breakpoint Slicer, Color Schemer, Compass, Compass Slideshow, Fancy Buttons, Fittext, Harsh, Modular Scale, Neat, Responsive Calculator, Responsive Sass, Salsa, Sassy Buttons, Sassy Math, Singularity.gs, Stipe, Susy, Toolkit, and Zen Grids
via SassMeister | The Sass Playground!

Chrome Web Store – Responsive Inspector (beta)

Responsive Inspector is a simple Google Chrome extension that allows viewing media queries of visited websites. It is very useful when developing responsive web layouts as it can visually show what resolutions are defined in css stylesheets. In addition it also has following features:

- pixel perfect browser resizing

- taking and saving whole page screenshots

- css media query code viewing

- sharing web designs on Behance.net service as Work In Progress

via Chrome Web Store – Responsive Inspector (beta).

Backbone.js

Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface.
via Backbone.js