HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
010 Editor - 010 Editor: Professional hex editor with Binary Templates. A fast, flexible, easy-to-use hex editor.
Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
Resource Hacker - Resource Hacker has been designed to be the complete resource editing tool.
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.
Hex Fiend - A fast and clever open source HEX editor for Mac OS X.