Heartface - One-click checkout for anything, sold by anyone, everywhere.
Quasar Framework - SPA front-end on steroids.
Xpresslane - Universal one click checkout for shopping on the internet
Flutter - Build beautiful native apps in record time 🚀
Checkout Page - Sell on your site with customizable checkouts. Tailor-made one page checkouts to sell digital products & services without an ecommerce store.
wxWidgets - wxWidgets: Cross-Platform GUI Library