Built on top of Node's Connect and Express, modeled after Ruby on Rails. Built for the client and server from the ground up.
Spine is opinionated in its approach to web application architecture and design. Spine's architecture complements patterns such as de-coupled components and CommonJS modules, markedly helping with code quality and maintainability.
Spine is tiny, the library comes in at around 500 lines of CoffeeScript, that's about 2K minified & compressed. Being lightweight and simple is fundamental to Spine.