HTML-Notepad - HTML WYSIWYG editor for structured documents
HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
WinHex - WinHex hex editor, disk editor, RAM editor. Binary editor for files, disks, and RAM. Download HEX EDITOR. Sector editor. Drive editor.
iNotepad - Write and organize all your texts and notes on Mac.
Hex Fiend - A fast and clever open source HEX editor for Mac OS X.