Explain Everything - Explain Everything is an easy-to-use design, screencasting, and interactive whiteboard tool that...
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Microsoft Whiteboard - The canvas where ideas, content, & people come together.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Conceptboard - Instant Whiteboards for Teams & Projects
LightShot - The fastest way to take a customizable screenshot.