Insteon
Insteon is a home automation hardware standard developed by Insteon. The technology employs both power line carrier and wireless technologies. It has many improvements over the X10 protocol and in most circumstances is far more reliable. Manufacturers of Insteon compatible products are:
Insteon hardware is widely available in the US and Canada (110v). While there are some Insteon devices available outside of North America, there is no USB interface that works outside of North America.
If you're interested in using Insteon with Indigo, we recommend reading through the Managing your Insteon Network document.