SharePoint Security Analyzer is a FREE and-on product that gives you an easy way to check permission levels for SharePoint objects and site users. The product shows users' permissions for all site elements in one view.
- Object permission review. How it works: A user enters the URL of the object and gets the list of users who have permissions to work with the object. The list of users can be grouped according to permissions levels, such as editors or viewers. The functionality also allows a user to view detailed information on the permissions each user holds.
- User permissions review. How it works: Choose a user and review the permissions set for that user as well as the objects of the site. The list of objects is represented in a form of a treeview, or as folders, and permissions levels are color coded.
To get Security Analyzer for free, visit vendor website.