Intellij IDEA compare directories plugin
Allows the fast comparison of two directories or archive files (jar, zip, war... and also tar/gz) in IntelliJ IDEA, based on file contents. Single file differences can be viewed with the usual IDEA diff window. Diffs in compiled Java classes can also be viewed using the usual IDEA diff window and a built-in Java disassembler. Detects blank-only differences in text files. Can also detect user-defined differences in text files and differences in source file comments, called «non-significant differences». Provides some basic mass-merging facilities on compared files and directories (copy/delete on files or directories).