HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
HTML-Notepad - HTML WYSIWYG editor for structured documents
WinHex - WinHex hex editor, disk editor, RAM editor. Binary editor for files, disks, and RAM. Download HEX EDITOR. Sector editor. Drive editor.
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
Hex Fiend - A fast and clever open source HEX editor for Mac OS X.
TED Notepad - TED Notepad is a portable text editor software that deals with a large variety of text processing tools, supplemental text clipboards, high accessibility through hotkeys, and a customizable number of settings and options.