Displays different menus for visitors and users logged in without using CSS display:none.
/wp-admin/nav-menus.phpfound under Appearance > Menus. Then select Screen Options at the top right. Then check CSS Classes. Then click Screen Options to hide the menu again.
wp-admin/themes.php?page=wps-filter-menuwhich is found under Appearance > Custom Menu Filter Settings
Again this plugin does not use CSS classes to hide menu items. Instead it uses the CSS Class information on the backend to filter these items out all together.