HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
Beyond Compare - Beyond Compare allows you to compare files and folders.
Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
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.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.