Moosend
Moosend is a popular all-in-one marketing platform that focuses on email marketing. Their SaaS product offers features like a drag & drop email editor, A/B testing, data analytics, list segmentation, email automation tools, and a landing page builder. Pricing starts at $10/month with a free tier for up to 1,000 email subscribers. Referral commissions are recurring as long as the customer remains a paying customer.