Twilio - Brings voice and messaging to your web and mobile applications.
Cakemail - Email marketing and transactional emails that deliver. Try it for FREE!
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Sinch - Sinch is a powerful voice and messaging SDK that lets you bring your apps to life with VoIP and...
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
httpSMS - Convert your Android phone into an SMS gateway to send an receive text messages