Avochato - Text messaging for your business.
ProTexting - ProTexting offers mobile marketing tools for businesses to communicate with their audience via SMS & MMS campaigns.
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
Clickatell - Simple, reliable mobile messaging cloud.