Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
BinHex CryPactor - Manipulate binary and hexadecimal strings!
PilotEdit - PilotEdit Lite is an advanced text and hex editor that supports opening of files larger than 4GB.
DHEX - Themeable hex editor with diff mode for tracking file changes.
iHex - iHex is the premier hex editor and data analysis tool for Mac OS X.
File Peek - Hex editor, file hashes and info.