Wammu is a program to manage data in your cell phone such as contacts, calendar or messages. Gammu SMSD is a service to mass send and receive SMS messages. Both these are built on top of Gammu library, which provides abstraction layer to work with different cell phones from different vendors (including Nokia, Sony-Ericsson, Motorola, Samsung, Siemens, Huawei and others).
Prey lets you keep track of your laptop, phone and tablet whenever stolen or missing -- easily and all in one place. It's lightweight, open source software that gives you full and remote control, 24/7.