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
010 Editor - 010 Editor: Professional hex editor with Binary Templates. A fast, flexible, easy-to-use hex editor.
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
Okteta - Okteta is a simple editor for the raw data of files.
iNotepad - Write and organize all your texts and notes on Mac.