Free Hex Editors
HxD is a Freeware hex editor that can handle very large files (> 4GB) and has built-in RAM and disk editor working under Win9x/WinNT+.
This is a freeware hex editor for the various flavors of Windows. According to the website there is no setup needed, and it does not add anything to the registry.
Cygnus Hex Editor FREE EDITION 1.00
This is the Lite or free version of a commercial product. See the website for a comparison of which features available in the commerical version are not available.
Hex Editor product family is a set of file editing tools for Windows with advanced binary editing capabilities. Basic features include data editing, exchanging data with other applications through the Clipboard, inserting new data and deleting existing data, and others. Advanced features include multiple selection, powerful Find All and Replace All commands, Goto and Fill commands, Bookmarks and printing capabilities.
1Fh Binary/Hex Editor
1Fh is program for fast opening and binary editing files regardless the size. It is capable of displaying file in machine code and in hex code. Current version is 1.05
Frhed is a native 32 bit Hex editor.
Binary (hexadecimal) editor for Windows
A Linux/UNIX (and Windows 95, 98, and NT) utility for the viewing and editing of binary files.