Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Plivo - Plivo simplifies your customer engagement.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.