Oria

Oria is a responsive masonry theme that lets you tell your stories in a clean and modern environment. Some of the features are: parallax header image, social menu, custom colors, easy access to all Google Fonts, a built-in featured posts carousel. A full demo is available here: http://demo.flyfreemedia.com/oria

Orbit

Orbit is a resposive free theme. It comes with 9 widgetized areas, 3 different page layouts, image slider in Front Page, Google Fonts, Social Networking links and free support in English and Spanish: http://bitado.com/soporte-orbit/

Orangy

Child-Theme of Twenty – The 2012 theme for WordPress is a fully responsive theme that looks great on any device. Features include a front page template with its own widgets, an optional display font, styling for post formats on both index and single views, and an optional no-sidebar page template. Make it yours with a custom menu, header image, and background.

Opulus Sombre

Opulus Sombre is a dark, modern, highly customizable and responsive (mobile-friendly) HTML5 and CSS3 WordPress theme that allows you to change the site’s colors, frontpage layout, headers, page templates, fonts, and much more! The responsive layout works with any browser so your website looks great on iPhones, Android phones, tablets and desktops. This theme will be ideal for design agencies, photography portfolios, architects, or any business that prizes modern, classy design. Opulus Sombre boasts an extensive custom theme options panel, up to 20 custom widgetized sidebars for your pages as well as a widgetized footer, simple social networking and script integration.

Optimizer

The Optimizer, an easy to customize multi-purpose theme with lots of powerful features. This theme lets you customize each element Live without you having to touch any code. The theme comes with 2 site layout: Full width & boxed, Beautiful image slider, easy Logo upload, 600+ Fonts, powerful theme options, Custom CSS Field & lots of Color options. The optimizer is 100% responsive built with HTML5 & CSS3, it’s SEO friendly, mobile optimized & retina ready. Its translation ready, ready for WooCommerce, bbPress, Mailchimp, Contact Form 7. The theme is rigorously tested and optimized for speed and faster page load time and has secure and clean code. It’s perfect for any types of website – Landing Pages, small business, portfolio, photography, corporate, personal & eCommerce websites.

Optimize

Optimize as name tells every thing completely optimized for search you will get 90+ page speed H1 and H2 Title Tags on page and posts WooCommerce Supported for eCommerce website. Google Adsense ready template show ads in single post, header or below navigation and widget as well. This is fully optimize style best for any kind of personal blog or business website it comes with Responsive design to increase mobile friendly.Fully featured control panel that support favicon link. Live working Demo http://demo.baztro.com/optimize/

Ophelia

Simple, creative and made with state of the art technology. The structure of this clean and responsive WordPress Theme will simplify your work with content. You can easily use it for any of your company’s activities. At the same time, you will be pleasantly surprised by the ease of using the administration panel, made specifically for small business requirements and necessities.