Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
AWS Amplify - JavaScript library for app development using cloud services
Plivo - Plivo simplifies your customer engagement.
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.