Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
FastMail - Email, calendars, and contacts to highest standards of security, privacy and reliability.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Loop Email - Emailing for teams: Organize your Inbox into channels 💌
Plivo - Plivo simplifies your customer engagement.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.