Ajax IM - Ajax IM (“Ajax Instant Messenger”) is a browser-centric instant messaging framework.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
MirrorFly - World's Most Scalable Voice, Video & Chat SDK for Small, Medium & Enterprises
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Applozic - Chat API & In-App Messaging SDK for Mobile & Web Apps Innovate fast, save development cost and delight users with a scalable, secure and customizable Chat
Plivo - Plivo simplifies your customer engagement.