SMS and Pager Toolkit 

Toolkit to Send and Receive SMS messages. Features SMSC providers (TAP,XIO,UCP), GSM devices (incl. WaveCom Fastrack) and GSM phones (incl. Nokia,Siemens,Motorola). TAPI,PDU,FBus and Unicode compliant. Samples for VC++, VB, VB.NET, VC#.NET and ASP.
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MobileAdmin 

MobileAdmin is a complete set of tools for monitoring and management of servers and applications specially designed for operating through mobiles. MobileAdmin clients providing reliable and protected messaging to server through different interfaces.
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Flash Terminal 

With Flash Terminal you can chat and exchange files via modem (including v.90, ISDN, ADSL) simultaneously without Internet! You can exchange up to 255 files at once with unlimited transfer resuming.
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Wireless-DS for gsm modem 

Wireless Dev Studio is an ActiveX DLL that allows you to send and receive SMS (also binary, flash, Unicode (UCS2) and ultiple SMS) through GSM modems. It handles voice and GSM data calls and the phonebooks of both SIM and terminal.
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