Smsframework is a project mainly written in PHP and JAVASCRIPT, it's free.
drupal module to integratew with sms services
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Provides a pluggable API for Drupal to interact with SMS messages.
Also integrates well with the Messaging module (http://drupal.org/project/messaging).
More information is available from the groups homepage at: http://groups.drupal.org/sms-framework
Documentation for site builders and developers is available in the handbook pages on Drupal.org at the following URL:
http://drupal.org/node/362258
Will White of Development Seed (http://drupal.org/user/32237) Tylor Sherman of Raincity Studios (http://drupal.org/user/143420)