Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Akismet - Akismet is a spam fighting service that protects millions of WordPress sites from comment and contact form spam.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
ConvertKit - Email marketing software for online creators. We help you earn a living online through an intuitive email marketing automation tool.
Plivo - Plivo simplifies your customer engagement.
Mediaocean - Mediaocean offers the infrastructure to automate the advertising workflow.