Widget Importer & Exporter is a free WordPress plugin which enables import and export functionality for WordPress widgets and their data. The plugin is very useful for moving widgets from one WP site to another, you can easily backup them and theme developers can provide users with sample widgets.
By default WordPress doesn’t provides you a separate way to export and import menu items but by using WordPress Menu Exporter plugin you can easily export all your site menus for backup or for using them in another website of yours.
If you are looking for a plugin that exports ALL user data and meta data of your WordPress site to CSV then WordPress plugin repository has one good working plugin, using it you can get users data on spreadsheet. Even you can export the users by role and registration date range.