BreakPoint Software, Inc.
Home of Hex Workshop, the Professional Hex Editor (and sector editor, base converter, and bit manipulator). [Commercial]
Hackman
An advanced hex editor and disassembler. News, support and related products such as language packs, plugins and add-ins.
Hexedit
Shows a file both in ASCII and in hexadecimal. Text mode program for Unix. [Open Source]
HexTool
A small and fast binary file and hex editor for DOS, with mouse interface. [Shareware]
Shed
Easy to use hex editor written for Unix/Linux using ncurses, with a friendly pico-style interface.
The HT Editor
A professional executable file editing tool which currently supports the MZ, PE and LE file formats including code analyser. For Windows and Unix. [Open Source]