0xED!

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).

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

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.

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. * data inspector to view decoded numbers * Has built-in script interpreter. * Easily works with huge files. * XVI32 allows to edit files up to 2 GB (enough virtual memory provided, of course) * For your convenience, XVI32 stores settings and last used search strings etc. in XVI32.INI file (portable) * Progress indication in percent for most operations * You can abort nearly all operations (reading/writing files, search, replace, print...) And many other features... »

A hexadecimal low level disk editor with extensive templates for NTFS, FAT and exFAT partitions

HexEdit is a powerful hex editor which can inspect files, drives and memory.Choose the File menu, for instance, and you can choose the file, storage device or block of RAM that you'd like to review. And this is unusually flexible, more so than we'd expect from such a small, portable utility. So if you choose to view RAM, for instance, then you're able to open your BIOS, System Management BIOS, Video BIOS or custom RAM range at a click.Once you've opened your target, you may browse its contents, use Search or Search and Replace tools, or edit the contents manually. If you need to open something else, go ahead - HexEdit adds a new tab for each project you start. And there are several unusual manipulation options, so for instance you can insert one file within another, append files, or convert files according to various encodings (ANSI, OEM Codepage 850, ASCII 7-bit, MAC, EBCDIC Codepage 038).And if that's still not enough, you also get powerful extras including a disassembler and scientific calculator: not bad for a portable tool, barely a 1MB download. »

Hiew (short for Hackers view) is a popular console hex editor for DOS and Windows written by Eugene Suslikov (sen). Amongst its feature set is its ability to view files in text, hex and disassembly mode. The program is particularly useful for editing executable files such as COFF, PE or ELF executable files.

Open Source powerful and flexible Hex-Editor, with multiple colour-schemes that allow easy visual indication of byte-magnitude.

JujuEdit is a file editor, or alternatively a text editor with knobs-on. It is an application designed for me and people like me. At its simplest, it makes a fine replacement for Notepad. It may appeal more to computer nerds who like syntax hilighting and advanced find/replace algorithms.