Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Plivo - Plivo simplifies your customer engagement.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.