ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Bloomfire - Let Bloomfire help you get organized! Organize your content, build your company knowledge base and help your employees to be more successful.
LightShot - The fastest way to take a customizable screenshot.
REWO - REWO is a knowledge documentation and distribution solution, which drastically improves capturing, visualizing and communicating knowledge.