WordPress Theme Twenty Fifteen Description:
Our 2015 default theme is clean, blog-focused, and designed for clarity. Twenty Fifteen's simple, straightforward typography is readable on a wide variety of screen sizes, and suitable for multiple languages. We designed it using a mobile-first approach, meaning your content takes center-stage, regardless of whether your visitors arrive by smartphone, tablet, laptop, or desktop computer.
Related to WordPress Theme Twenty Fifteen
WPSlug.com data has a list of 967 WordPress CMS installations Using the WordPress Theme Twenty Fifteen.