Free Hex Editor!

GNU Emacs is an extensible, customizable text editor—and more. At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing. The features of GNU Emacs include:

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).

wxHexEditor is an open source cross-platform disk/sector/file hex editor written in C++ with a wxWidgets-based user interface.

wxMEdit is a cross-platform text and hex editor, derived from MadEdit . It adds automatic updates, bookmarks, selecting lines with a tripple click, a FreeBASIC syntax file, more supported encodings (L1, CP850, CP437 etc, KOI8, UTF-x), better Max OS X and Windows support, better hex editing support, nicer dialogs based on Code::Blocks wxSmith, more localizations, is a bit more stable and comes with an improved build system.

PE Explorer lets you look inside a variety of different 32-bit Windows executable file types, such as EXE, DLL and ActiveX Controls, perform static analysis, reveal a lot of information about the function of the executable, and collect as much information about the executable file as possible, without executing it. PE Explorer provides functions for disassembly and inspection of unknown binaries, modification of the properties of executable files, plus resource editing and translation features.

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. Features an editor with standard Cut, Copy, and Paste commands, support for huge files, and unlimited Undo and Redo for all editing operations. Use the Inspector to easily edit data in a number of different formats.

A fast and clever open source HEX editor for Mac OS X.

MadEdit is an Open-Source and Cross-Platform Text/Hex Editor written in C++ and wxWidgets.

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.

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.

FileAlyzer is a tool to analyze files, allows a basic analysis of files (showing file properties and file contents in hex dump form) and is able to interpret common file contents like resources structures (like text, graphics, HTML, media and PE).

GHex - a hex editor for GNOME

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. Editing can be done both in the value column and the character column. Besides the usual editing capabilities Okteta also brings a small set of tools, like a table listing decodings into common simple data types, a table listing all possible bytes with its character and value equivalents, a info view with a statistic and a filter tool. »