Bootstrap is a toolkit from Twitter designed to kickstart development of webapps and sites.
It includes base CSS and HTML for typography, forms, buttons, tables, grids, navigation, and more.

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. This is also the engine behind GitHub Pages, which you can use to host your project’s page or blog right here from GitHub.

Nanoc3 blog starter kit

A simple HTML to ePub converter. You have to give repub a few pointers about where to find, eg, the table of contents, but that means it can handle a wide variety of HTML-formatted documents.

A parser for a condensed HTML format

Logic-less templates.

Bookmark this! XML and HTML character entity references. #aea

"HTML5 Boilerplate is the professional badass's base HTML/CSS/JS template for a fast, robust and future-proof site."

wrttn is a simple notepad with many useful features.

HTML5 & CSS3 READINESS

jeremy keith

The Big Web Show Episode 2: HTML5 with Jeremy Keith is now online for your viewing pleasure:

Webby is a fantastic little website management system. It would be called a content management system if it were a bigger kid. But, it’s just a runt with a special knack for transforming text. And that’s really all it does – manages the legwork of turning text into something else, an ASCII Alchemist if you will.