the seeker 

The worlds FIRST and BEST Web productivity application for Windows. Search multiple search engines, Movies, Weather, Dictionary, Thesaurus, Encyclopedia, send FREE SMS messages, shop Amazon.com, and check Stocks all from ONE application!
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Mizo - ICQSMS Companion 

Mizo - ICQSMS Companion allows you to send free SMS worldwide using ICQ's excellent SMS sending feature. Compose your SMS offline and send them to the Outbox, and send these SMS when you get online. Includes Address Book, History log, etc...
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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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