PackageExplorer displays the hierarchical decomposition of packages in: class categories, classes, protocols and methods. Core methods are listed first, extension methods second. Attributes to these entities may be shown e.g. the fact whether a class comes with a class comment or the text of the class comment. Invoke: PackageExplorer new openExplorerFor: 'Moose'. For several packages: PackageExplorer new openExplorerFor: #('EMOF' 'FAMIX2' 'Famix' 'Moose' 'SmartCollections'). Find details in the comment of PackageExplorer.