ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Live.ly - Live.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Mux Live Streaming API - A simple API to powerful live video streaming
LightShot - The fastest way to take a customizable screenshot.
Look - Live video streaming in your chats and groups