Google Open Source - All of Googles open source projects under a single umbrella
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
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
Plivo - Plivo simplifies your customer engagement.