A simple, text based Java Bytecode Editor. It uses ObjectWeb ASM (http://asm.ow2.org/) and the RSyntaxTextArea from https://github.com/bobbylight/RSyntaxTextArea

Get the precompiled version from here: https://github.com/SuspiciousActivity/Random-Java-Stuff/blob/master/ByteEdit.jar

To open up a file, drag it onto the left side. To save a class, press CTRL + S on the right side, to save the jar file, press on the left side. With F5 you can reload either the file or only the class.