Plivo - Plivo simplifies your customer engagement.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
SendBird - SendBird is messaging-as-a-service.
QuickBlox - Cloud communication and data backend.
Infobip - A2P messaging platform for enterprises, resellers & mobile operators with global network coverage.