Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.
Plivo - Plivo simplifies your customer engagement.
userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.