This Free Responsive WordPress Theme that features 9 page Templates such as Blog, Blog Summary and Template based layout designs: sidebar/content, sidebar/content half, content/sidebar and content/sidebar half. This is a very flexible theme and very nice looking to boot! Perfect for those business style portfolio sites.
Responsive Twenty Ten is a child theme of the default WordPress theme. This free responsive wordpress theme has been based on Todd Halfpenny’s Responsive Twenty Ten with the addition of some special touches such as flexible images, nice margins, and some mobile image rules.
Scherzo is a clean, readable free responsive wordpress theme that boasts a mobile first design, which means it displays perfectly on all mobile phones as well as desktop monitors.
Yoko is a flexible HTML5/CSS3 responsive wordpress theme. With the responsive layout based on CSS3 media queries, the theme adjusts to different screen sizes.
The Constellation theme is a good starting point for any WordPress project. It has the flexibility to provide custom styles for different devices, up-to-date HTML5 code, and a flexible grid system.
So there we have it, my top 5 free responsive WordPress Themes. Happy blogging!