Twilio - Brings voice and messaging to your web and mobile applications.
Cakemail - Email marketing and transactional emails that deliver. Try it for FREE!
Plivo - Plivo simplifies your customer engagement.
Hatchbuck - SMB sales and marketing software
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.