Facebook Live Video and Collages - Show your friends what you’re seeing in real time
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
DUSK - Anonymous live video
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Periscope on Twitter for iOS - Stream live video inside your tweets
LightShot - The fastest way to take a customizable screenshot.