Jasmin SMS Gateway - Jasmin is a very complete open source SMS Gateway with many enterprise-class features such as:
EZ Texting - EZ Texting provides SMS marketing solutions to businesses of all sizes.
Bulk SMS Services - Sending Bulk SMS to the customers will engage the customers with your business and new offers.
SimpleTexting - SimpleTexting offers SMS and text marketing services for companies of all sizes.
MyTask - MyTask is a centralized platform designed for office management, invoice management, and work management that allows a business to have the required service agility.
Textmagic - The all-in-one solution for all your business texting needs - marketing campaigns, two-way SMS chats, reminders, notifications, and internal staff communication.