Java Bytecode Editor is an open sourced Java Bytecode Editor, it's succeeded by CJBE.

Download, Website.

I took the original Java Bytecode Editor and put all of the classes into a simple jar. I think it is easier to use this way:
http://rghost.net/6bY9DVlNr

I took the original Java Bytecode Editor and put all of the classes into a simple jar. I think it is easier to use this way:
http://rghost.net/6bY9DVlNr

Very useful, cheers!