Recently I have been elaborating with Node-RED (Node.js based) on the Raspberry Pi. It's an amazing frame work with a huge number of available plugins (called nodes) for various hardware and software integration.
Since I already added and integrated a MQTT broker with ONH on the same RPi, it was dead simple to integrate with Node-RED running on another RPi.
I just see a wonderful marriage between the two, leveraging the best of both
If you look at Node-RED you find already support for those Belkin Wemo lamps as well as for Philips HUE. One major advantage with Node-RED besides the huge support for various stuff is the easy straight forward configuration