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Kalkun is an open source web-based SMS (Short Message Service) manager.
It uses Gammu SMSD (part of gammu family) as SMS gateway engine to deliver and retrieve messages from your phone/modem.
Documentation is on the wiki: https://github.com/kalkun-sms/Kalkun/wiki
Development and source code can be found on github: https://github.com/kalkun-sms/Kalkun/
simple javascript SMS example with sms gateway API
https://www.proovl.com/sms-api
Simple html form for sms sending with AJAX / jQuery post (javascript) and sms gateway.
Send sms without page refresh. You can insert html part to your site.
Token and Api link must be stored in php file. widget style SMS script to your site.
sms numbers
https://www.groovl.com