Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
PilotEdit - PilotEdit Lite is an advanced text and hex editor that supports opening of files larger than 4GB.
BinHex CryPactor - Manipulate binary and hexadecimal strings!
HextEdit - HextEdit is a proficient hex editor and disassembler for Mac.
iHex - iHex is the premier hex editor and data analysis tool for Mac OS X.
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.