Gumroad Memberships - Earn your audience's ongoing support
GumHub - Sell access to your GitHub repos with Gumroad
Plasso.com - Payments made simple. Sell subscriptions & products online.
PayPal.Me - Request money using your own personalized URL.
Flodesk - Simple, Flat rate, Unlimited, All-in-one newsletter solution.
XetHub - Scaling Git and GitHub to support 1 TB repos