HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...

HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.

IDA - The best-of-breed binary code analysis tool, an indispensable item in the toolbox of world-class software analysts, reverse engineers, malware analyst and cybersecurity professionals.

Dr.Explain - Dr.Explain software is a help file authoring tool.

Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows

CHM Editor - Best solution to edit CHM files