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Twilio - Brings voice and messaging to your web and mobile applications.
LINK Mobility - LINK Mobility is Europe's leading provider within mobile communications, specialising in mobile SMS messaging, digital services and multi-channel conversational communication.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Melrose Labs SMSC Simulator - SMPP SMSC simulator to test SMS messaging applications.
BulkSMS - SMS messaging service provider offering two-way SMS communication services.
SMSAPI - SMSAPI.com is browser platform for bulk SMS and other SMS marketing solutions.