Twinme - Twinme – Private Messenger is a free, secure, instant, and high-definition messaging app that protects your privacy along with giving you full control over each of your relationships and contents.
Direct SMS - Direct SMS is an SMS API & SMS Software provider specializing in SMS services in Australia.
Textra - Textra is a seriously beautiful, feature rich SMS and MMS app.
Twilio SMS - Send and receive text messages globally with Twilio SMS.
Material Messaging - Material Messaging is a beautiful communication app that lets you send and receive SMS and MMS messages using the intuitive interface while giving you complete control over every aspect of your messaging experience.
nimbusIT API SMS Service - nimbusIT API SMS Service is a website that persuades you to send bulk SMS on smartphones for digital or online marketing of a specific brand and logo.