Apps similar to WinHex include Digler, which is free and open source. Other options are ImHex, HxD, dz6 and 010 Editor. There's no shortage of Hex Editors like WinHex, with more than 25 alternatives for Windows, Linux, Mac, Android and the web.
HexEdit is a Windows hex editor, user-friendly and reliable with advanced features (full undo, macros, background searches, calculator, full customization, edits huge files).
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Free Hex Editor Neo - Fastest Binary File Editing Software for Windows. Large Files Optimized Freeware Hex Editor
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YuHex is a simple binary editor for Windows. It provides the essential features needed to work with binary files, including editing, searching, and changing text encodings.
Japan
PE Explorer is the most feature-packed program for inspecting the inner workings of your own software, and more importantly, third party Windows applications and libraries for which you do not have source code.
Canada
XVI32 is a freeware hex editor. XVI32 has the following main features.
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A Freeware hex editor allows users to view and edit files in binary mode, search for particular content or address in the file.
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HexEdit is a hexadecimal file editor for Microsoft Windows. HexEdit allows the user to view and edit any type of file, no matter what format it is saved in.
United Kingdom
Open Source powerful and flexible Hex-Editor, with multiple colour-schemes that allow easy visual indication of byte-magnitude.
RJ TextEd is a full featured text and source editor with Unicode support, syntax highlighting and code folding. The functionality extends beyond text files and includes support for HTML editing with integrated preview, spell checking, auto completion, HTML validation, templates...
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