Mediamodifier - Create beautiful designs and product mockups in seconds.
iOS Jetpack - Beautiful easy-to-use screenshot templates for App Store
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
App Screenshot Maker - Design marketing screenshots for your app in minutes
mockDrop - Is a webapp for creating free device mockups including your screenshots.
Promomatic - Easily create beautiful app store assets