REHex is described as 'A cross-platform (Windows, Linux, Mac, BSD) hex editor for reverse engineering, and everything else' and is an app in the development category. There are more than 25 alternatives to REHex for a variety of platforms, including Windows, Mac, Linux, BSD and Android apps. The best REHex alternative is ImHex, which is both free and Open Source. Other great apps like REHex are HxD, Rizin, wxHexEditor and 010 Editor.
ImHex is a free, featureful Hex Editor with many tools often only found in paid products. It includes a custom built scripting language for highlighting and decoding binary data, a disassembler, extensive file analysis tools and much much more
ImHex is the most popular Windows, Mac & Linux alternative to REHex.
ImHex is the most popular Open Source & free alternative to REHex.
HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and modifying of main memory (RAM), handles files of any size.
Rizin is a feature rich reverse engineering framework in development, focusing on stability and high code quality, a welcoming and curious community culture and implementation of cutting edge binary analysis research.
Rizin is the most popular Android alternative to REHex.
Hex Editor. Support editing or comparing (diff) very large files up to 2^64 bytes. Cross-platform Linux, Mac OS, Windows.
010 Editor is a professional text/hex editor designed to edit any file, drive, or process on your machine. Using Binary Templates technology, 010 Editor allows a binary file to be parsed into a data structure that can be understood.
010 Editor is the most popular commercial alternative to REHex.
Radare project started as a forensics tool, a scriptable commandline hexadecimal editor able to open disk files, but later support for analyzing binaries, disassembling code, debugging programs, attaching to remote gdb servers, ...
radare2 is the most popular iPhone, iPad & Android Tablet alternative to REHex.
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.
WinHex is a hexadecimal editor capable of opening disks, sectors, files (native support for FAT, NTFS, Ext2/3, ReiserFS, Reiser4, UFS, CDFS, UDF) and physical memory (RAM). It can read, write and extract data for a further forensic analysis.
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.
Kaitai Struct is a formal language for binary format specification that can be compiled into parser code in Java, JavaScript, Python and Ruby.
BinEd is a hex editor tool, which allows to directly browse and edit content of any file or binary data.
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