jekyll
Jekyll is a simple, blog aware, static site generator. It takes a template directory (representing the raw form of a website), runs it through Textile or Markdown and Liquid converters, and spits out a complete, static website suitable for serving with Apache or your favorite web server.
Well worth considering if you’re building a site that doesn’t require a full-blown CMS, or if you like the idea of keeping your entire site under version control.
More on the advantages and disadvantages of SSGs here.