Textlocal API2 Wrapper is a PHP class that can send SMS or MMS messages using the Textlocal API over HTTP. It can send an SMS or MMS message to a given number, send a message to a group of contacts, create groups of contacts, add contacts to a group, retrieve the available groups, delete contacts from a group, delete groups, retrieve message history, etc.
TextMagic Messenger lets you send and receive text messages from your computer. It supports sending of messages to large groups, messages of up to 459 characters, a built-in phone book, and the ability to set your own mobile number or a company name as the sender ID. Replies are forwarded to your email address or TextMagic Messenger inbox.
SD SMS Master is an SMS-sending server. The Web server (master) contains the SMS Master itself. Clients (users) connect to the master and create orders. Orders contain a text to send and a list of numbers to send to. The master then connects to remote machines (slaves) and distributes the order numbers (+text) to all enabled phones on the slaves. The communication is one-way; incoming SMSes are not read.