Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
X Steps Recorder - A clone of Microsoft's Problem Steps Recorder, but for linux.
Bloomfire - Let Bloomfire help you get organized! Organize your content, build your company knowledge base and help your employees to be more successful.
Folge - The fastest tool for creating step-by-step guides.
REWO - REWO is a knowledge documentation and distribution solution, which drastically improves capturing, visualizing and communicating knowledge.
Snagit - Screen Capture Software for Windows and Mac