The best free alternative to Hex Fiend is ImHex, which is also Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Hex Fiend and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Hex Fiend are HxD, wxHexEditor, Okteta and Bless.
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
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.
Hex Editor. Support editing or comparing (diff) very large files up to 2^64 bytes. Cross-platform Linux, Mac OS, Windows.
Okteta is a simple editor for the raw data of files. This type of program is also called hex editor or binary editor. The data is displayed in the traditional view with two columns: one with the numeric values and one with the assigned characters.
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.
BinEd is a hex editor tool, which allows to directly browse and edit content of any file or binary data.
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.
XVI32 is a freeware hex editor. XVI32 has the following main features.
HexEd.it is a free hex editor for all modern operating systems. It uses web technology to enable online hexediting, directly in the browser. Analyse binary dumps and files, read, manipulate, write, import and export any data in this webapp.
A hexadecimal low level disk editor with extensive templates for NTFS, FAT and exFAT partitions
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It's much more modern and has many features often just found in paid alternatives