Every blogger likes free WordPress themes. Here are four responsive WordPress themes available free of cost.
Murmur is packed with powerful blogging features, it is a portfolio theme and works better for showcasing web design and photography projects. you can manage your team/staff member profiles etc.
SimpleCorp is Corporate and portfolio theme. Its main features include responsive Design, HTML5 and CSS3, Built-in Pagination, Built-in Contact Form, Theme Options Panel
Clean Response is a multi-purpose WordPress theme that gives two homepages choice. Use it for business or for running a blog.
Built without clutter with minimalist view, good for small websites or as a starter theme.