Cortana is a Home Automation AI that I have been working on for the last year or two. One of these days it'll be open sourced and show up here. Until then, I am open sourceing some packages and modules I've written as part of my project.
-Project Intro: http://www.zebpalmer.com/2013/03/cortana-home-automation-a-i-intro/
-Irrigation Controller: https://github.com/zebpalmer/IrrigationD
-WeatherAlerts: https://github.com/zebpalmer/WeatherAlerts