Stranger Studios is the company behind the Paid Memberships Pro and Sitewide Sales plugins.
Paid Memberships Pro is the most complete membership platform for WordPress and also works well with WooCommerce. PMPro and its WooCommerce Add On are both available for free from the WordPress.org repository.
Sitewide Sales is the best way to run Black Friday, Cyber Monday, and other flash sales on your WooCommerce-powered site.
From the blog
Commercial Plugins, Membership Sites, Subscriptions, SaaS