WebSMS 

Sends Short Messages (SMS) to mobile phones using WEB Servers directly form the user's PC. It has an address book, standard messages, and a history list of the sent messages. There is also a bulk SMS function. It supports free and prepaid servers.
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FastSMS III 

Powerful tool,which allows you to send SMS via the Internet directly to cellphones of most cellular providers worldwide. It has an exclusive and easy-to-manage interface adapted to SMS standards and offers you more extended features for SMS delivery
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VbSMS 

VbSMS is designed to Send SMS messages through GSM phones connected to your PC/server by Infrared, Bluetooth or data cable. Samples provided for Visual Basic, Visual C# .NET.
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SMSCOuntry XLbox 

SMS-XLbox seamlessly integrates with Microsoft® Excel® and enables you to send bulk SMS text messages to mobile phones across the world from your PC using Microsoft® Excel®. SMS text delivered in 182 countries across 489 networks.
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Redcoal Mobile Messenger 

Redcoal Mobile Messenger. Just click the 'Send SMS' created by this easy-to-install program and send and receive SMS messages to your field employees, staff, clients, partners and friends in 130 countries
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