1)   SMS and Pager Toolkit 4.1
SMS ActiveX Component for Windows, to send and receive SMS messages. Support for GSM modems and SMPP service centers. Samples included for VB, VC/C++, VB .NET, VC# .NET, ASP, ASP .NET, Java, PHP. Product of the Year at http://www.smssolutions.net
SMS, GSM, MMS, SMPP, PDU, TAP, XIO, SMSC, FBus, Nokia,

 2)   SMS-it 3.3.7
SMS-it allows you to send SMS (Text, pictures, ringtones) to a mobile phone from your computer. It sends through a modem, the internet or an attached mobile phone
SMS, UCP, XIO, TAP, PDU, PAGER, NOKIA, ring tones, pictures, group logo,

 3)   SMS and MMS Toolkit 5.0
Send and receive SMS messages via a GSM/GPRS modem, HTTP-POST provider or SMPP provider. Send and receive MMS messages via MM1 (GPRS), MM4 (SMTP) or MM7 (XML/SOAP). Samples for VB, VC++, VB.NET, VC#.NET, ASP, ASP .NET, Javascript, PHP and more
SMS, GSM, MMS, SMPP, PDU, TAP, XIO, SMSC, GPRS, UMTS,

 4)   HS GSM SMS C Source Library 1.3
HS GSM SMS is a C source library. It provides a PC based user application with access to a mobile phone's Short Message Service (SMS) function, according to ETSI standards: GSM 07.05 (ETS 300 585) (use of DTE for SMS), GSM 03.40 (SMS)
GSM, SMS, Short, Message, Service, C, Source, Library, PDU,