RavenDesk is the ready to use free software which sends SMS via internet.
Installable on Windows, Mac OSX, translated in 10 languages.
Developed on the innovative Adobe AIR.
RavenDesk, in addition to being easy to use, lets you send thousands of SMS in just a few seconds, manage an address book organized in groups and send SMS longer than 160 characters with the chance to delay delivery by specifying deliver date and time.
Furthermore, you can send SMS customizing the message sender with your name or telephone number.