Sidebar & Widget Manager can display sidebars and widgets based on user role. The new filter includes all default WordPress user roles, all roles created separately and an option to choose users that are not logged in.
The new filter works for all new sidebars created by the plugin and all widgets in Appearance -> Widgets. Existing sidebars can be replaced with sidebars visible for each or few user roles.
This is very flexible tool for filtering content based on user role.