Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
UI8 - Carefully crafted UI design assets
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
UI Movement - The best UI design inspiration, daily
LightShot - The fastest way to take a customizable screenshot.
UI Garage - Specific mobile and web design patterns for your inspiration