http://jadclipse.sourceforge.net/wiki/index.php/Main_Page#Download

After installing I tried to decompile a class but got error - org.eclipse.core.runtime.CoreException: The Class File Viewer cannot handle the given input (‘org.eclipse.ui.ide.FileStoreEditorInput’)

This forum post gives the solution to the above problem - http://java.decompiler.free.fr/?q=node/370