HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
010 Editor - 010 Editor: Professional hex editor with Binary Templates. A fast, flexible, easy-to-use hex editor.
WinHex - WinHex hex editor, disk editor, RAM editor. Binary editor for files, disks, and RAM. Download HEX EDITOR. Sector editor. Drive editor.
iBored - iBored is not a pure hex editor but rather a disk block editor, which also can be used to edit files in hex.
Resource Hacker - Resource Hacker has been designed to be the complete resource editing tool.
Hex Fiend - A fast and clever open source HEX editor for Mac OS X.