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.
Pico is a fast, full featured mobile application for any Java (J2ME) or Symbian cellphone. Including full HTML Web browsing, feature-rich email, multimedia-enabled SMS, and an RSS feed reader, Pico combines all the rich functionality of PicoWeb, PicoMail, PicoSMS, and PicoRSS into a single application.