Infinite is a free theme for WordPress created by Ravi Chandra.
Infinite is a clean, responsive, retina ready and fully responsive wordpress theme for business websites, blogs and portfolio websites to showcase your work.
(Description "Infinite" Theme from wordpress.org)
You can download Infinite for free via the provided download link and include it into your themes folder of your WordPress installation. Also you can directly search for it in the WordPress admin interface in the themes section and install and activate it from there.
More information, screenshots and reviews of Infinite Theme can be found here.