eusms.net 

eusms.net is a free software for Microsoft Windows to send text messages (SMS) via internet. You just pay the messages you send. You can even set the delivery time, send Flash-SMS or anonymous messages.
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starmsg.com 

Starmsg.com is a freeware that allows you to send text sms messages from your PC to mobile phones all over the world. You can set the delivery time for text messages, send Flash SMS or anonymous text messages. Universal charges apply.
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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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Air Messenger LAN Server 

The Air Messenger LAN Server is a great investment for companies that run a large sales force or dispatch centers. All sales people or dispatchers can send pages through one network computer.
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Air Messenger Pro 

Air Messenger Pro is a fully featured alphanumeric paging software with TAP, SNPP, ETAP, and E-Mail support that allows you to send pages to Pagers and Digital Cellular Phones.
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Air Messenger Mobile 

Air Messenger Mobile is a fully featured alphanumeric paging software with TAP, SNPP, ETAP, and E-Mail support that allows you to send pages to Pagers and Digital Cellular Phones.
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