Tarski

An elegant, flexible theme with built-in display options and alternate styles. Tarski includes support for aside-style posts, comes with numerous default header images, and translations are available for over 20 different languages. It is extremely customisable, both by the usual WordPress mechanisms such as custom headers, backgrounds and menus, but also by its support for custom CSS files and an extensive, well-documented API that gives child theme and plugin authors a huge amount of control without needing to modify the theme's files, making upgrading to new versions simple.