Tree - Write documents in tree-like organisation with Markdown
Google Payment API - Enable an easy-to-use checkout experience for customers
TabNotes - Markdown notepad in your new tab
Giftbit Payment API - Stripe for gift cards
Markdown New Tab - Write notes in Markdown directly in the 'New Tab' page
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.