Twilio - Brings voice and messaging to your web and mobile applications.
Swell.is - Customizable, API-first ecommerce platform for innovative brands, startups, and agencies.
Plivo - Plivo simplifies your customer engagement.
Vendure - Open-source headless e-commerce framework for developers
SendBird - SendBird is messaging-as-a-service.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.