Hello,
about two weeks ago I finished development of an SMS text messaging software for Windows and Mac platforms. It is suited for bulk and group text messaging as well as for SMS-based marketing campaigns.
Multiple recipients lists, customized message contents, scheduled messaging and more features are available.
The software is compatible to most SMS gateways providing an HTTP(S)-based interface.
A free evaluation copy (shareware release) can be found on my website: TOBIAS EICHNER IT + CONSULTING - Information Technology Is Our Universe !
Maybe someone is finding it useful. 
Have a nice day,
Tobias.
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