Twilio - Brings voice and messaging to your web and mobile applications.
Google Open Source - All of Googles open source projects under a single umbrella
Plivo - Plivo simplifies your customer engagement.
Open Source @IFTTT - A collection of IFTTT OSS projects.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Code NASA - 253 NASA open source software projects