Eco Tree is free template with 3-column layout. About page features different columns. Blog post includes comments with multiple levels.
Simplex is free responsive template based on Bootstrap 3.0.0 and this layout works on both mobile and desktop devices.
Blactro is easy website layout based on Windows 8 metro style UI. Horizontal sliding transition is applied for changing pages.
Catalog theme is a HTML5-CSS3 template based on Twitter Bootstrap (version 3.0) that can work in any screen size and mobile devices.
Dragonfly is a small one-page layout using jQuery and nivoSlider. It is free website template from templatemo.com that can be used for any purpose.