1)   SMS and Pager Toolkit 4.1
SMS Control to send and receive SMS messages. Features GSM modems (incl. WaveCom, Multitech), SMPP and SMSC (TAP,XIO,UCP) and GSM phones (incl. Nokia,Siemens,Motorola). Samples for VB.NET, VC#.NET, VC++, Visual Basic, ASP and ASP.NET
SMS, GSM, MMS, SMPP, PDU, TAP, XIO, SMSC, FBus, Nokia,

 2)   ActiveXperts SMS Messaging Server 4.0
SMS messaging framework for sending, receiving and processing SMS messages. Database oriented (MS Access, MS SQL, Oracle). Support for GSM modems, SMPP providers, POP3 and SMTP. Includes an API to process incoming messages.
SMS, SMPP, GSM, modem, WaveCom, MultiTech, Clickatell, SMSC, FBUS, WAP,