Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Streaks - The to-do list that helps you form good habits.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Taskful - Deadlines, meet your match.
Plivo - Plivo simplifies your customer engagement.
ToDoList - Windows desktop application to stay on top of your daily tasks.