WordPress can presently export all of its content via WXR, and then import that through the WordPress Importer plugin. That process includes all posts, terms, menus, comments, and users, but it doesn't touch options. In addition to general settings, options can include widget configurations, plugin settings, theme settings, and lots more. This can be very time-consuming to migrate manually. WP Options Importer aims to fill that void and save us all a lot of time.
WP Options Importer allows you to export all options to a JSON file, and then you can selectively import them into another WordPress installation. The import process is very transparent, and it even shows you what data you'll be importing. Lastly, it gives you the option to override existing settings or to skip options that already exist.