Easymailing - Email Marketing platform. User friendly and beautiful design
Twilio - Brings voice and messaging to your web and mobile applications.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
FromDoppler - Doppler is an email marketing solution to create, manage and analyze newsletter marketing campaigns.
BulkSMS - SMS messaging service provider offering two-way SMS communication services.