Bless is described as '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' and is an app in the development category. There are more than 25 alternatives to Bless for a variety of platforms, including Windows, Linux, Mac, BSD and PortableApps.com apps. The best Bless alternative is ImHex, which is both free and Open Source. Other great apps like Bless are HxD, UltraEdit, 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 Bless.
ImHex is the most popular Open Source & free alternative to Bless.
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.
UltraEdit is the ideal text, HTML and HEX editor, and an advanced PHP, Perl, Java and JavaScript editor for programmers. An industry-award winner, UltraEdit supports disk-based 64-bit file handling (standard) on 32-bit Windows platforms (Windows 2000 and later).
UltraEdit is the most popular commercial alternative to Bless.
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.
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.
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.
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.
A cross-platform (Windows, Linux, Mac, BSD) hex editor for reverse engineering, and everything else.
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Okteta is written by KDE with Qt. While Bless still uses gtk2, which is deprecated.