JadRetro is a command-line tool that transforms Java classes to enable successful decompilation by modern Java compilers of version 1.4 and later. It is not a decompiler but supports decompilers in their task.
It's important to note that JadRetro isn't a decompiler itself; rather, it's a class transformer that helps outdated decompilers generate more correct source code or convert more class files. JadRetro has been tested and works best when used with JAD, a popular Java Decompiler.
Overall, JadRetro is a useful tool that can help you extract source code from Java classes created with modern compilers, and its integration with JAD makes it a valuable addition to any developer's toolkit.
Version 1.6: none