Clickatell - Simple, reliable mobile messaging cloud.
Avochato - Text messaging for your business.
Trumpia - SMS Marketing and Marketing Automation software for Mass SMS, internal communications & emergency alerts. #1 Text Messaging Service used by Fortune 500s.
Postscript - Like Mailchimp for SMS
ShoutOUT - All in one business texting tool to send personalized alerts, promotions, reminders, short links and marketing campaigns, for any SMEs (hotels, restaurants, education, non profits, Woocommerce, banks, healthcare, agencies, supermarkets, weddings)
GetChat.App - Add WhatsApp chat to your website for free