A theme framework is a theme that is designed to be a flexible foundation that can serve as a parent theme for building child themes. The use of WordPress theme frameworks may ease theme development by reducing the volume of work which may be needed in creating a backbone for your theme (usually by using PHP and WordPress Template Tags).
Theme frameworks also make theme development more accessible, removing the need for programming knowledge.
Build your own unique, professional and browser-safe WordPress Theme: 1-5 columns, fluid or fixed width, rotating header images and 2 dozen option pages. Support and tutorials at our forum.
A rich blogger friendly theme with customizable header, colors and AJAX options; and developer friendly theme with atomic templates and an elegant override hierarchy.
A user-friendly, search-engine optimized theme framework, featuring 15 custom page templates and multiple widget-ready areas, allowing you to create any type of site you want.
Rich with powerful and dynamic semantic class selectors, Sandbox is a canvas for CSS artists.
The Buffet Framework
The Buffet Framework is a theme framework designed not only for the theme developers who will be using the theme actions and filters to create the child themes, but also for the end users who would be able to add and remove what they want.
The ultimate in SEO-ready themes, Thematic is a highly extensible, WordPress Theme Framework featuring 13 widget-ready areas, drop-down menus, grid-based layout samples, plugin integration, shortcodes for your footer, & a whole lot more. Perfect for any blog and the starting point for theme development.
A blank WordPress Theme Framework that’s everything you need, and nothing you don’t. With features like microformats, a traditional template structure, convention over configuration, clean semantic code, documenation, and it’s atomic templating system, WP Framework is completely extensible, flexible and the starting point for theme authoring and customization. To learn more, visit http://wpframework.com.