Linked Diagram Navigator and Elements Cleaner extensions developed by Marco Zille are available in Extension Registry. The first extension (Linked Diagram Navigator) lets the user navigate to a diagram attached to an element with a simple right-click. The second extension (Elements Cleaner) searches inside the project for all the items that have nothing connected and shows them inside a list where the user can choose to remove each element. These extensions are open source and hosted on Github (https://github.com/zillemarco/StarUML_LinkedDiagramNavigator) (https://github.com/zillemarco/StarUML_ElementsCleaner). Thanks to Marco.