For designers and developers that frequently work with WordPress, theme frameworks and starter themes can have a noticeable impact of efficiency. Frameworks and starter themes can eliminate some of the repetitive work that you probably do with each custom theme. In addition, many frameworks provide additional features that can make your theme more powerful with less development time. In the past year or two, responsive frameworks have become more popular. Since designing and developing responsive sites and themes can be highly time consuming, these frameworks can be a great resource. In this post we’ll take a look at 15 of the best free WordPress theme frameworks and starter themes. There are also a number of outstanding premium options, but in this post we’ll focus on the free ones. Despite being free, these resources can be highly valuable. Bones The Bones framework comes in two variations: classic and responsive. The classic version is built on the 960 Grid. The responsive version gives you are starting point to design for multiple devices, with a stylesheet set up for media queries and a mobile first approach. Bones isn’t intended to be a framework for which you develop child themes. Instead, it is intended to be a project template.