Homeseer is a Windows based home automation controller. I used it briefly as the central controller for my house before abandoning it in favour of a home grown xAP solution - I found homeseer tended to be slow and unreliable, and the framework it provides was too constrained to be able to readily meet my needs. That said, I know that a lot of people find it perfect for their needs. So here are three useful plug-ins for Homeseer.
Meteor Caller Id plug-in The Caller-Id plug-in allows Crucible Technologies' caller id unit to notify Homeseer of incoming telephone calls. This plug-in was designed for use with the first generation meteor caller id unit which didn't provide on-hook and off-hook indication. Several people have told me that the plug-in doesn't work well with the second generation units - if you want to lend me a second generation unit, I'll willingly update the plug-in to work with it.