swagger.io - Swagger is an open source RESTapi Documentation Tool.
Sable - Free bank account and credit card for internationals
Link to QR - Free beautiful QR codes
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.
Slate API Docs Generator - Create beautiful, intelligent, responsive API documentation.
Wise - Currency exchange Banks and other providers could charge you up to 5% in hidden costs when sending ...