Zipsell - A free, open source platform for selling digital downloads
Gumroad Memberships - Earn your audience's ongoing support
Ko-fi - Ko-fi offers a friendly way for content creators to get paid for their work.
Plasso.com - Payments made simple. Sell subscriptions & products online.
SuperPay - Get paid faster with your own custom payments page
PayPal.Me - Request money using your own personalized URL.