ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Stonly - Create interactive step-by-step guides
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
UserGuiding - User onboarding made easy, for less. Create product walkthroughs in a couple of clicks, without breaking the bank.
LightShot - The fastest way to take a customizable screenshot.
ScribeHow - Create step-by-step user guides, with a simple click