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Project status is an extension for drush which takes a list of Drupal platforms as arguments and returns a list of modules which are in use or not in use by the sites within these platforms. It is able to list all modules, or only those which are in use, by platform and site. By default it only reports on modules within sites/all/ or sites/default/, but it can optionally report on modules within site directories as well. Results are grouped by project (for example, the modules views and views_ui are shown together as views) unless an option is given to list each module separately.
In brief, this module was written to answer the question, "which modules in this shared platform are actually in use, and by which sites?"