PayPal.Me - Request money using your own personalized URL.
Checkout Page - Sell on your site with customizable checkouts. Tailor-made one page checkouts to sell digital products & services without an ecommerce store.
Solo - Personal kanban boards hosted on your own server
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
Zipsell - A free, open source platform for selling digital downloads
Stripe Elements - Beautiful, smart checkout flows 💳💸