Group Text Messenger 

if you are looking for a solution that allows you to send large volumes of SMS messages to mobile phones then look no further, Accusoftware has a tried and tested system that not only gets the messages to the intended recipients but also saves money.
sms text communication gsm mobile phone phone messages messaging short messages groups contacts sales estate agency competitions

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.
sms pdu tap xio gsm smsc fbus nokia unicode tapi wavecom wap gprs infrared

PageGate 

Messaging server software sends: SMS text messages to: pagers, mobile phones. Messages can be accepted from: networked computers, email, web pages, commandline, text files, serial ports, modems. Messages can be sent via Web or modem.
sms paging text messaging text messaging paging software pager pager software mobile mobile phone alphanumeric paging software wireless wireless messaging