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AppMockUp - Create the most compelling screenshots for your app.
JustRecruit.co - Easy to use, low-cost recruitment software and websites, perfect for start-ups, small and growing recruitment businesses
Placeit - Generate realistic product shots in seconds
draw.io - Online diagramming application
Smartmockups - Create stunning product mockups, easily and online.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.