Affiliate system allow affiliates to earn a profit through purchases/subscription made by their clients. It encourages your members to share and introduce your website to others. It is a perfect tool to track referrals to your website.
Course plugin allows you to add an online course facility to your website. A very resourceful module for both an educational based website or when you just need to offer courses to your members . Course Plugin is built with all the features you will need to add a learning feature to your website. Course module is everything you need.