nexmo

Nexmo is a global cloud communications platform, providing APIs and SDKs for SMS, voice, phone verification, messaging and advanced multi-channel conversations. We have officially supported open source libraries for Node.JS, Ruby, Python, PHP, Java and C# .NET enabling you to build scalable communications features such as two-factor authentication, notifications, two-way and group messaging, one to one or multi person calls, all with the technologies that you are already using.