Belkin WeMo Wireless Switch
From Belkin WeMo website:
Ecobee Smart Plugs enable homeowners who have an Ecobee Smart Thermostat to wirelessly control and monitor 120V appliances from any computer connected to the internet.
The Kill-A-Watt EZ is the big brother to the Kill-A-Watt. It has all the features of the Kill-A-Watt but also includes the ability for users to energy their kWh rate so they can see what appliances cost them to operate (without having to do the math themselves). Power cost information is retained by a battery backup.
The UFO Power Center by Visible Energy is a power strip on steroids. It acts as a power strip, home energy monitor and electric appliance timer all in one.
From the UFO Power Center How It Works section:
The Kill-A-Watt is an appliance energy monitor that can help you monitor your 120 V electricity users. You plug it into an outlet, and then plug an appliance into it to see how much energy it uses. Like most appliance energy monitors, the Kill-A-Watt only measures 120 V loads. Bigger electricity consumers like your AC units or your electric dryer are probably on 240 V breakers, so to monitor these you will need a whole home or whole home circuit level energy monitor.
Amazon Description:
The Belkin Conserve Insight Energy Cost Monitor is the main competitor to the Kill-A-Watt and Kill-A-Watt EZ. Both of these energy monitoring devices monitor single appliances on a 120 V outlet.