Open Source Java 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.

Free and open source hex editor written in Java. This is standalone desktop app, library for Java applications as well as variants for Java IDEs are also available.

A stream editor that can be invoked by another java program or also the command line. It can handle binary data too. Unlike newline based programs like sed, it allows different ways of reading the stream through the traverser, buffer and commands interfaces. A traverser decides how the data is read. This data is stored in the buffer. The commands decide what to do with this data. All data is handled as characters, by specifying an encoding. For binary data, the encoding ISO-8859-1 is used by default, has 256 single-byte characters. Data in the buffer is available as a charsequence to the commands for stuff like regex matching etc. The output can be redirected to a file, and an output encoding can be specified.The commands can also store/retrive arbitrary data for later use in a map. Evaluation of expressions in commands is done using Apache Jexl, and custom functions can also be used. Sample java usage and sample command line usage examples are included.

ClassyShark is a standalone binary inspection tool for Android developers. It can reliably browse any Android executable and show important info such as class interfaces and members, dex counts and dependencies. ClassyShark supports multiple formats including libraries (.dex, .aar, .so), executables (.apk, .jar, .class) and all Android binary XMLs: AndroidManifest, resources, layouts etc. We developed this software because we needed something lighting fast and incredibly lightweight for browsing Android APKs, so that we could check right away if everything we wanted was right inside the final executable. Right after ClassyShark loads your executable, you will see, in the left panel, the list of the root components of the archive. You can activate the view by simply clicking on the Methods count tab on top of the navigation tree.

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.

Jout (Java optimization utility toolkit) is a complete workground for editing .class files. It includes automatic and manual optimization.

This project aims to be the continuation of the Wicket Bench project: http://www.laughingpanda.org/mediawiki/index.php/Wicket_Bench. Why Stump? Because no other better name was found ;) @see: http://en.wikipedia.org/wiki/Stump_(cricket)

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.

This small Java based application can read / display / unpack sims 3 package files. A simple search interface is also provided.