HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
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.
PilotEdit - PilotEdit Lite is an advanced text and hex editor that supports opening of files larger than 4GB.
Hex Fiend - A fast and clever open source HEX editor for Mac OS X.
HextEdit - HextEdit is a proficient hex editor and disassembler for Mac.
010 Editor - 010 Editor: Professional hex editor with Binary Templates. A fast, flexible, easy-to-use hex editor.