Jasmin SMS Gateway - Jasmin is a very complete open source SMS Gateway with many enterprise-class features such as:
Infobip - A2P messaging platform for enterprises, resellers & mobile operators with global network coverage.
Ozeki NG SMS Gateway - Ozeki NG SMS Gateway is a powerful, reliable and flexible SMS Gateway application.
ClickSend - ClickSend builds communication software and tools for businesses. We offer SMS, MMS, Voice, Email, Online Mail and even Fax. All accessed via our Dashboard, app, flexible API or integrations.
Bulk SMS Services - Sending Bulk SMS to the customers will engage the customers with your business and new offers.
Textmagic - The all-in-one solution for all your business texting needs - marketing campaigns, two-way SMS chats, reminders, notifications, and internal staff communication.