JBytedit

JBytedit, created by Quux, is an open-source, fully featured graphical Java Bytecode editor. JBytedit aims for easy code inspection and manipulation, no matter in which JVM based language it is coded.

It is perfectly suitable as an alternative to other Bytecode Editors, like reJ. Unlike some of other bytecode editors, it uses the ASM tree API, which is perfectly adapted for GUI integration. It also comes with tools for easy navigation in code, syntax highlighting, ZKM string deobfsucation and more.

JBytedit needs Java 8 or higher to run and is in early development, therefore it may contain bugs, but anyone can contribute to the project by making pull requests on https://github.com/QMatt/JBytedit