Smartmockups - Create stunning product mockups, easily and online.
Placeit - Generate realistic product shots in seconds
AppLaunchpad - Create free beautiful screenshots for App store/Google play
Mediamodifier - Create beautiful designs and product mockups in seconds.
Magic Mockups - Place your product screenshot in real-life environment.Free iMac and iPad mockups ... read more.
MockuPhone - Easily wrap app screenshots in devices