Viktor Szépe

Enables users with <code>list_users</code> capability (Editors and Administrators) 
to send plain text message to any user in an email.
There is a new action “Send message” provided on the Users admin page 
for each user.

Send message

Send an email (subject and text message) to WordPress users.

daif

Send SMS using <a href="http://smsgw.net/" rel="nofollow ugc">SMSgw.net</a> as main provider and others providers like <a href="http://mobily.ws/" rel="nofollow ugc">Mobily.ws</a>, <a href="http://4jawaly.net/" rel="nofollow ugc">4jawaly.net</a>, <a href="http://malath.net.sa/" rel="nofollow ugc">Malath.net.sa</a>, <a href="http://resalty.net/" rel="nofollow ugc">Resalty.net</a> and <a href="http://ashharsms.com" rel="nofollow ugc">AshharSMS.com</a>.

SMS Sender

Send SMS using smsgw.net or any other providers.

Send message vs SMS Sender