Promomatic - Easily create beautiful app store assets
iOS Jetpack - Beautiful easy-to-use screenshot templates for App Store
App Screenshot Maker - Design marketing screenshots for your app in minutes
Smartmockups - Create stunning product mockups, easily and online.
DaVinci Apps - Сreate customized screenshots for your app in just 3 steps
AppLaunchpad - Create free beautiful screenshots for App store/Google play