Google Singleton Detector

The Google Singleton Detector, or GSD, is a tool which analyzes Java bytecode and detects the use of four different types of global state, including singletons, hingletons, mingletons and fingletons. Then it outputs a graph with all these different types of static state highlighted, and shows all the classes that are directly dependent on them. The point of this tool is to allow you to see all of the uses of global state inside a project, as well as how they are all interrelated.

Worth to give a look here.