Thesis WordPress Framework GPL Overview:

A thesis is a modular template and design system for WordPress. It’s what would happen if WordPress suddenly decided to replace its core template “system”¹ with something more robust that would enable you to:

• Build Themes with a visual interface instead of being forced to deal with clunky hybrid PHP + HTML files
• Turn code in template files into living HTML objects that can be edited moved around, and extended for additional functionality
• Create dynamic CSS that adapts to user input
• Backup, restore, import, and export Theme data (templates, CSS, and associated options)

The thesis enhances your WordPress installation with this awesome functionality, but it does a hell of a lot more, too.