Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
Lacona - Fast, simple, powerful keyboard-driven commands for Mac
Dr.Explain - Dr.Explain software is a help file authoring tool.
MacPlus Software - Useful Mac Applications, Utilities for Mac Desktop, etc.
CHM Editor - Best solution to edit CHM files