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 in java that can handle text/binary formats
...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.
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.
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.