Psi-IM - Psi-IM is a messaging program that is designed for the XMPP network.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Gajim - Full featured and easy to use Jabber client
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
CoyIM - CoyIM is a safe and secure chat client.
Plivo - Plivo simplifies your customer engagement.