Apps similar to HextEdit include ImHex, which is free and open source. Other options are HxD, Hex Fiend, wxHexEditor and 010 Editor. You're spoiled for choice with Hex Editors like HextEdit: we list more than 25 alternatives for Windows, Linux, Mac and the web.
DHEX is a more than just another hex editor: It includes a diff mode, which can be used to easily and conveniently compare two binary files. Since it is based on ncurses and is themeable, it can run on any number of systems and scenarios.
The Hex Editor From Hell! Hecate is a terminal hex editor that, instead of putting the (ASCII) representation of bytes way out on the right side of the screen, it puts the interpreted values directly beneath the hex representation.
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Tweak is a hex editor. It allows you to edit a file at very low level, letting you see the full and exact binary contents of the file. It can be useful for modifying binary files such as executables, editing disk or CD images, debugging programs that generate binary file formats...
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