http://developers.belkin.com/wemo/

Belkin WeMo SDK Download Page

The very philosophy of our company, "People Inspired Products", centers on creating products inspired by the consumer. WeMo technology is built from the ground up to enhance everyday life by answering the need of the consumer for greater control of their life. With that in mind, we want to give you even more capability to explore just what you can do with WeMo. Here we have provided the WeMo Local SDK. With this kit, you can build and modify your own apps to unleash the full potential of your connected home devices in the ways that you see fit. This local SDK is designed so that you can explore WeMo and use it as a tool to make it your own. Create it, tweak it, rework it; whatever you want to do with WeMo on a local level, now you can. All the action happens here. The app allows you to control your connected devices through a variety of ways. Through integration with rules and IFTTT, room for customization is huge. With the SDK, you can modify what the app does at the local level.