The ICP DAS SMS Database System is free and can be used with up to 3 phones. An advanced version is available that can support more phones. It's used for managing SMS devices like GT-53x which can be used to turn things on or off via text message.
SMS DBS License: $999.00 SMS Database System Pro software for managing GT-53x Intelligent SMS Controllers for Windows 7, XP, Vista and 2000 Operating Systems. Free for use with up to 3 phones.
ICP DAS USA, Inc.
888-971-9888 ext 105