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Roots is an excellent open source WordPress starter theme. It’s built with HTML5 Boilerplate and Bootstrap (if you don’t need it, you can replace or remove it). It also has
Underscores, or _s, is a free blank WordPress theme developed by Automattic, the creators of WordPress. It has five layout templates. Unfortunately, Underscores doesn’t have a pre-built responsive layout, so you’ll have to create one.
Bones is a free blank theme built on top of HTML5 Boilerplate. It’s responsive, and developed under the Mobile First philosophy. WPtuts+ has an excellent
This is a Web-performance optimized blank WordPress theme for developers. The HTML5 Blank WordPress Theme comes with useful custom theme functions such as a dynamic sidebar as well as boilerplate code for using WordPress’s Shortcode API in your themes. Demo | Download Page (html5blank.com)
This blank WordPress theme is great for people who want to learn how to develop themes. The Naked WordPress theme is commented in-line so that as you’re building your WordPress theme, you understand what’s actually going on. It’s like a WordPress tutorial + starter theme combined.
WP-Flex is a responsive blank WordPress theme. It’s got serious features that web developers will appreciate, such as
JointsWP is built on top of Foundation 5 (a major front-end development framework alongside Bootstrap). You have the option to use the Sass version, or just plain CSS version if you want.
BlankSlate is probably the most simple, minimalist blank/boilerplate theme you can get your hands on. BlankSlate is the middle ground between creating WordPress themes entirely from scratch and using a big starter themes like Roots or Underscore.