SMSify is a free WordPress plugin that allows you to send personalised SMS messages to a large number of contacts very quickly.
SMSify is a premium SMS plugin that allows you to send and receive SMS within your own WordPress dashboard. This plugin has been built with performance in mind and it does not modify your database. This plugin allows you to import contacts from a csv file and schedule recurring SMS messages. It features a native WordPress interface that is very simple to use. Screenshots available.
Full list of features: