Alexey Veretennikov (fourier) has a nice project on Github. Ztree is a set of two Emacs utilities that deal with directories in a tree-based way. The first, ztree-dir provides a tree representation of a directory. Branches can be opened to drill down on the directory structure to provide finer detail.
The ztree-diff utility compares two directories. Differences in their structures are revealed but by drilling down you can see differences in individual files. This is one of those utilities that you probably won’t use everyday but when you need it, it’s just the thing.
The README for the project has screen shots from both utilities so you can see what the output looks like. These look like really useful tools that you will probably want to add to your package list. Ztree is available from MELPA so it’s easy to install and keep up to date.