Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
HextEdit - HextEdit is a proficient hex editor and disassembler for Mac.
BinHex CryPactor - Manipulate binary and hexadecimal strings!
iHex - iHex is the premier hex editor and data analysis tool for Mac OS X.
DHEX - Themeable hex editor with diff mode for tracking file changes.
FlexHex - FlexHEX is a full-featured hex editor designed to edit binary files, OLE compound files, logical devices, and physical drives. With FlexHEX you can inspect, modify, insert, search, or replace binary, ASCII, or UNICODE data.