Seald - Keep your conversations secure, everywhere.
Twilio - Brings voice and messaging to your web and mobile applications.
Keybase Chat - End-to-end encrypted chat built into Keybase
Plivo - Plivo simplifies your customer engagement.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.