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 Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
Okteta - Okteta is a simple editor for the raw data of files.
PilotEdit - PilotEdit Lite is an advanced text and hex editor that supports opening of files larger than 4GB.
BinHex CryPactor - Manipulate binary and hexadecimal strings!
WinHex - WinHex hex editor, disk editor, RAM editor. Binary editor for files, disks, and RAM. Download HEX EDITOR. Sector editor. Drive editor.