EmEditor - EmEditor is a fast Unicode text editor for Windows 7/Vista/XP/2000 supporting large files...
Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
glogg - glogg is a multi-platform GUI application to browse and search through long or complex log files.
BinHex CryPactor - Manipulate binary and hexadecimal strings!
Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
PilotEdit - PilotEdit Lite is an advanced text and hex editor that supports opening of files larger than 4GB.