Metalsmith
An extremely simple, pluggable static site generator for Node.js
...Metalsmith translates a directory tree to plain Javascript objects that you can manipulate effortlessly with your selection of plugins. You shouldn't have to bend your project needs to a specific framework or tool. Metalsmith gives you full control of how you want to conceptualize, structure, and build your project. Use Metalsmith to generate anything from a static site to a scaffolder, backup, command line, or deploy tool. Configuration over code or code over configuration: Metalsmith supports both.