Apps similar to HxD include ImHex, which is free and open source. Other options are dz6, 010 Editor, wxHexEditor and Hex Fiend. There's no shortage of Hex Editors like HxD, with more than 50 alternatives for Windows, Linux, Mac, Android and the web.
XVI32 is a freeware hex editor. XVI32 has the following main features.
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Kaitai Struct is a formal language for binary format specification that can be compiled into parser code in Java, JavaScript, Python and Ruby.
Hexer is an open-source hex editor for Windows featuring direct view of all kinds of data interpretations, and in-line data type annotation system with markers which is reusable across files.
McAfee FileInsight, developed by McAfee Labs, is an integrated tool environment for website and file analysis. Its many built-in editing and analysis features can be easily extended through simple Python-based plugins.
Malcat is a feature-rich hexadecimal editor / disassembler / decompiler for reverse engineers and malware analysts. It has support for many file formats and CPUs, can scan for signatures, decrypt/decompress data, diff files and run python scripts.
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Bless is a high quality, full featured hex editor. It is written in mono/Gtk# and its primary platform is GNU/Linux. However it should be able to run without problems on every platform that mono and Gtk# run on.
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PilotEdit Lite is an advanced text and hex editor that supports opening of files larger than 4GB. It offers customizable syntax and keyword highlighting, advanced search and replace operations, HEX mode, column mode, and more.
GHex - a hex editor for GNOME
GHex allows the user to load data from any file, view and edit it in either hex or ascii.
Useful for debugging problems with object code or encodings.
Also used by kids who cheat at computer games, by adding score or lives to saved games.
Windows 11 hex editor with 100 interface language variants, 107 regional choices, and RTL layouts. Inspect binary structures, search data, and edit in your language.
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HextEdit is a fast and lightweight hex editor for viewing and editing binary data. Quickly edit virtually any file type at a low level in a simple and native app. It features fast incremental find, a byte inspector and generally fast performance as a native app.
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