iLend - Keep track of the things you lend and borrow.
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.
Owy - Keep track of the things people owe you
Bonsai Payments - Simple invoicing & ACH payments for freelancers
Litch.app - Easily sell products and subscriptions with Stripe 💵
Squarify.io - Sync inventory between Square and Shopify.