AffiliateWP Affiliate Plugin for WordPress
AffiliateWP is an easy-to-use, reliable WordPress plugin that gives you the affiliate marketing tools you need to grow your business and make more money. This affiliate plugin provides a complete affiliate management system for your WordPress website that seamlessly integrates with all major WordPress e-commerce and membership platforms. Complete Integration. and it also has complete integration with all major WordPress ecommerce and membership plugins.
Easy Digital Downloads and Restrict Content Pro are also under the developer Pippins.