Link Whisper should work with most plugins that use Custom Post Types to store data. This covers many of the highest rated WordPress plugins, and is the standard way to store data on WordPress.
Typically if the plugin has a section on the admin menu and allows you to create items, the plugin uses Custom Post Types to create it’s data.
Probably the best known example would be WooCommerce. All of it’s product and order information is stored in Custom Post Types and is accessible to Link Whisper.