binary-editor
There are 4 repositories under binary-editor topic.
exbin/bined
BinEd Binary/Hex Editor
kusumi/fileobj
Ncurses based hex editor with vi interface (upstream)
quintinfsmith/sbyte
An in-console byte editor. Work in progress, but fairly stable for basic work.
TheGreatRambler/binary-viewer
A binary viewer written in java. Has a built-in hex viewer and can edit binary in an easy fashion.