WP-Flex is a responsive blank WordPress theme. It’s got serious features that web developers will appreciate, such as sample data for unit testing and strict compliance with the official WordPress theming guidelines.
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.
The tutorial series by ThemeShaper (a major WordPress theme development company) will help you learn how to create WP themes using Underscores.
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 Bones tutorial to help you get started with this awesome starter theme.
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 Grunt files for quickly compiling LESS code and combining your CSS and JS files.
A nifty feature of Roots is its Theme Wrapper, which helps you avoid having to write the same code in multiple files.
Check out themes built using Roots at the Roots Gallery. Get started with Roots by heading over to the project’s official docs.
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.
This is a cool blank responsive Bootstrap WordPress theme for responsive designers. When you check it out you will come to know that here’s no frills, just base coding with the standard Bootstrap framework along with the PHP files needed to make a theme work.
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.
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.
This blank theme helps you start off on the right track towards producing a semantic and structurally-sound HTML5 WordPress themes. For example, the post template included in the HTML5 Reset WordPress Theme incorporates the hNews microformat to help search engines better understand your content.
This open source project took the popular HTML5 Boilerplate and converted it to a blank WordPress theme.
The HTML5 Boilerplate for WordPress project uses a modern HTML5 blog structure based on Opera Web evangelist Bruce Lawson’s recommended structural markup for blogs:
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