WPDBTotalCleaner is the new WordPress plugin which provides you a very easy way to clean up unnecessary Database tables from your WordPress site. The plugin is simple, lightweight and is compatible with bot single and multisite WordPress installations.
Long time ago we discussed about the plugins that allows you to export users to CSV file like Users to CSV, Export Users to CSV for WordPress and BP Export Users for BuddyPress. Now this tutorial explains you how you can easily import users from CSV file to your WordPress website.
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.