SMS Local Agency - SMS Local Agency is a Complete White Label Bulk Texting Marketing System.
Jasmin SMS Gateway - Jasmin is a very complete open source SMS Gateway with many enterprise-class features such as:
chompSMS - chompSMS is a communication app developed and published by Delicious for Android and iOS devices.
Ozeki NG SMS Gateway - Ozeki NG SMS Gateway is a powerful, reliable and flexible SMS Gateway application.
iRealSMS - Do you love your iPhone but hate the limited Messages app?
Bulk SMS Services - Sending Bulk SMS to the customers will engage the customers with your business and new offers.