Vim - Highly configurable text editor built to enable efficient text editing
HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
Kakoune - Vim inspiredâââFaster as in less keystrokesâââMultiple selectionsâââOrthogonal design
WinHex - WinHex hex editor, disk editor, RAM editor. Binary editor for files, disks, and RAM. Download HEX EDITOR. Sector editor. Drive editor.
qemacs (for quick emacs) - Savannah is a central point for development, distribution and maintenance of free software, both GNU and non-GNU.
Hex Fiend - A fast and clever open source HEX editor for Mac OS X.