Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Nintex - Cloud-based digital workflow management automation platform
Plivo - Plivo simplifies your customer engagement.
ProcessMaker - ProcessMaker is an easy to use BPM and workflow software solution. It is used to design, automate, and deploy business processes of any kind.