As the name explains, Subscribe to Unlock is a premium WordPress plugin which makes it fast and easy to capture subscribers right from your WordPress site by simply locking some specific content of your site until users subscribe to your site.
Demo: https://codecanyon.net/item/subscribe-to-unlock-opt-in-content-locker-wordpress-plugin/24210892
Subscribe to Download - Download after Email Subscription WordPress Plugin makes it fast and easy to capture subscribers right from your WordPress site by simply providing them a freebies to download through email after successful subscription.
Demo: https://codecanyon.net/item/subscribe-to-download-an-advanced-subscription-plugin-for-wordpress/24020447