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.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Shopify Pay - Give shoppers a fast, secure way to pay
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Stripe iOS SDK - Accept both Apple Pay and credit card payments easily on iOS
Slack - A messaging app for teams who see through the Earth!