Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Mizmoz - Easy-to-use, state of the art, email service provider dedicated to support growing businesses.
VerifyKit - Enables quick access to your web and mobile applications.
Flexmail Solution - Professional email marketing with powerful and easy-to-use features
Twilio - Brings voice and messaging to your web and mobile applications.
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.