Open Source Hex Editors

Kryo is a fast and efficient binary object graph serialization framework for Java. The goals of the project are high speed, low size, and an easy-to-use API. The project is useful any time objects need to be persisted, whether to a file, database or over the network. Kryo can also perform automatic deep and shallow copying/cloning. This is direct copying from object to object, not object to bytes to object. Kryo has three sets of methods for reading and writing objects. If the concrete class of the object is not known and the object could be null. Besides methods to read and write objects, the Kryo class provides a way to register serializers, reads and writes class identifiers efficiently, handles null objects for serializers that can't accept nulls, and handles reading and writing object references (if enabled). This allows serializers to focus on their serialization tasks.

ELF File Viewer implemented as a Total Commander plugin

Need to create binary files with data for Your program, game etc.? Tired of using hex-editor and editing the file manually with the risk of structure-mismatches? Too lazy to reedit complete file after changing structure members order or size? "data2bin" is a utility that takes: 1. Your structures description (you can use integers of different sizes and endiannesses, null-terminated text strings, fixed-size binary strings, structures, arrays...) 2. Your data in a XML file written down according to defined structure. ... and produces final binary file. It is able to pad Your strings with defined padding, check Your integers' sizes, it can fill default values where You didn't supply data, it can also, for example, put a "blank" array member at the end of an array etc. Whenever You change your structure in Your code, just update the data-description file and "rebuild" Your binary files without touching XML data files!

Acid is a module and a simple application for displaying content of binary data files. It relies on plugins for parsing file formats.

BinGrok is a hex editor designed specifically to aid in reverse engineering of binary formats. Development moved to GitHub at https://github.com/spuriousdata/BinGrok

This project is about creating a program that allow to view binary code and to create structure out of it. The main purpose is to make it easier to reverse engineer binary file.

ELF Workbench is a program intended for analyzing/inspecting ELF object files that also allows to patch them. It provides an interactive user interface similar to that used by GDB. See feature list below for more details.

Everything is a Text, and the Text is the Numbers. Concept project to render virtually anything with numbers and text.

Farben is a Java-based universal binary file reader and writer. Easily view binary files hierarchically. Edit embedded file metadata in a variety of formats. Identify orphaned files. A wide variety of file formats will be included.

Wh32Edit is an army and savegame editor for the game Dark Omen

Klang is a project that allows viewing and editing of binary files in a structured way. Unlike traditional hex editors, Klang provides a hierarchical view of many binary file types that can be 'chunked', such as WAV and AIFF.