Storyboard That - Storyboard That is the world's best online storyboard creator.
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
Storyboarder - Storyboarder makes it easy to visualize a story as fast you can draw stick figures.
Dr.Explain - Dr.Explain software is a help file authoring tool.
Microsoft Cortana - Microsoft Cortana – Digital Assistant app brings a smart assistant to your smartphone to help keep track of the important stuff, introduced by Microsoft.
CHM Editor - Best solution to edit CHM files