Kannel - Open Source WAP and SMS Gateway
KAPSYSTEM - KAP Computer Solutions Pvt. Ltd.,
Bulk SMS Services - Sending Bulk SMS to the customers will engage the customers with your business and new offers.
BudgetSMS.net - Cheap SMS Gateway with simple HTTP API to send SMS messages worldwide.
Power SMPP - Enterprise grade messaging software
Digimiles - Digimiles is A2P messaging platform that enables startups, SMEs, businesses and corporate's to market their products and interact with their customers 24/7 effectively.