SuperNormal - Async video updates for remote teams
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Threadit by Google - Short video recordings for async collaboration
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Breve - Breve helps you to record and send frequent video updates to your team.
LightShot - The fastest way to take a customizable screenshot.