LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Jasmin SMS Gateway - Jasmin is a very complete open source SMS Gateway with many enterprise-class features such as:
IG MASS DMS - Seamlessly reach any target audience by using our mass dm software.
Ozeki NG SMS Gateway - Ozeki NG SMS Gateway is a powerful, reliable and flexible SMS Gateway application.
Promote Route - A Better WhatsApp™ Experience
Bulk SMS Services - Sending Bulk SMS to the customers will engage the customers with your business and new offers.