Programmable voice/telephony
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Twilio
Twilio – Communication APIs for SMS: Voice: Video and Authentication
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MessageBird
MessageBird
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Plivo
Plivo – APIs for SMS: Voice Calls & Phone Numbers Globally.
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Infobip
Infobip: The Global Communications Platform for Business
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Ytel
Ytel: Communications API & Contact Center Software
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46elks
46elks – Telecom infrastructure for the web
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Kaleyra
Kaleyra – evolving mobile platform
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Nexmo
Nexmo – APIs for SMS: Voice and Phone Verifications