Theme Tuner is a plugin that allows you to edit in real-time the look-and-feel of your site.
The Theme Tuner plugin allows to adjust in real-time your theme. You downloaded a theme that you like but aren't happy with the background color, simply click on the page and change the color. Or you're not happy with the font size in the header, simply click on the header and increase or decrease the font size.
It also includes a bunch of extensions which allow you to change the layout of your pages and posts by simply including a shortcode. A number of widgets are included as well that allow you to for example make it easier to navigate your site. Easy to use to fine tune any WordPress theme.