Twilio - Brings voice and messaging to your web and mobile applications.
Zoho Creator - Zoho Creator is a low-code application development platform that helps you build a custom, mobile-ready apps to run your business.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Bizness Apps - Create your own app or become a reseller and build apps for others
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.