Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
MyChat - Secure instant messenger for any network
Plivo - Plivo simplifies your customer engagement.
Output Messenger - Secure instant messenger app for office provides seamless instant messaging solutions for all office, corporate and enterprise business communication needs.