by MAW Consulting SMS-it allows you to send SMS to a mobile phone from your computer. It sends through a modem, the internet (free SMS) or an attached mobile phone. SMS-it can integrate with MS Outlook and synchronize the inbox to store the messages.
by Hillstone Software 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)