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.
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.
Kannel - Open Source WAP and SMS Gateway
Teckst - Teckst is a cloud-based SMS marketing tool and two-way texting solution designed for contact centers and customer service companies.
Bulk SMS Services - Sending Bulk SMS to the customers will engage the customers with your business and new offers.