dnGREP - dnGrep allows you to search across files with easy-to-read results.
HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
PowerGREP - Quickly search through large numbers of files on your PC or network using powerful text patterns to find exactly the information you want. Search and replace with plain text or regular expressions to maintain web sites, source code, reports, ...
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.