Promomatic - Easily create beautiful app store assets
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
AppLaunchpad - Create free beautiful screenshots for App store/Google play
Thum.io - A real-time website screenshot generator
Screenshot Designer - Create engaging App Store screenshots
Blink - Blink is a team and employee app, with a Feed, Chat and Hub (for documents, links, files).