Nice tool for exploring Java Jar files visually. See below link
My colleagues at Massey University, New Zealand, Jens Dietrich have created a tool called Architecture Explorer. It is a dependency graph analysis tool which is server-based. It supports several metrics, perspectives, antipatterns, and tangle analysis. Corpus programs are preloaded (‘select data’). The application is in ‘advanced beta’ mode , i.e. it is well tested but they are not yet sure how the server copes with load (the pattern analysis is done on the server on the fly). They invite you to test-drive it, and complete the (very short) feedback form after you have done so (link to feedback for is in the toolbar). The tool works with the latest version of either Chrome, Safari, FF or Opera to use it, Internet Explorer is not supported.