OneColumn is a free, basic, clean, responsive, mobile friendly, one-column WordPress theme. Default theme language is English but Dutch, German, Spanish, French and Swedish are supported too. 2 widget-areas underneath header-image, 2 widget-areas in footer, custom header-image, custom background, display logo or blogname and description and dropdown navigation are included. Besides this no theme settings page, no fancy options, no slideshow, this one only has the basic options. Enjoy.
Click on image for demo!