Domoticz is a Home Automation system that lets you monitor and configure various devices like: Lights, Switches, various sensors/meters like Temperature, Rain, Wind, UV, Electra, Gas, Water and much more. Notifications/Alerts can be send to any mobile device.
DomotiGa is Open Source Home Automation Software from the Netherlands. It is written in Gambas Basic and runs on Linux.
HomeSeer HS3 is an advanced home automation and remote access software package works with a wide variety of hardware. Once installed, you'll be able to monitor and control your home from any Web browser (locally or remotely) via computer, PDA, PocketPC, or cell phone.