fileobj is a portable hex editor with vi like interface.
This software provides basic vi commands for binary editing.
Features include insert, replace, delete data in hexadecimal or ascii,
cut and paste, undo and redo, visual select, partial buffer loading,
multiple buffers support, multiple windows support,
block device (raw disk) support, mapping binary data to C struct, etc.

WWW: https://github.com/kusumi/fileobj/tree/v0.7