Ape Mockups - A huge hand-curated collection of free high-quality mockups
Elegant Themes - Simple, yet beautiful WordPress themes with easy to use implementation and support.
AppLaunchpad - Create free beautiful screenshots for App store/Google play
MH Themes - An online platform where you can get premium Magazines themes online for your sites like news, blogs, and others.
Clay Mockups - Free set of beautiful device mockups for your designs
ThemeGrill - ThemeGrill is an online marketplace that develops and sells WordPress themes and plugins that you can buy to create professional websites for businesses, magazines, and blogs.