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 900+ integrations.
Twilio - Brings voice and messaging to your web and mobile applications.
Infobip - A2P messaging platform for enterprises, resellers & mobile operators with global network coverage.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Teckst - Teckst is a cloud-based SMS marketing tool and two-way texting solution designed for contact centers and customer service companies.
Clockwork SMS - Clockwork is an Easy Text Message API. An SMS API for Developers. Build powerful apps and include SMS. Signup is free, Try it now.