Thriot is an open source IoT platform.
There are no real usages yet, but since it's open anybody can make use of it.
The main advantage of this platform is that it has configurable and extendable storage system so you can store the configuration, telemetry data and M2M messages where you wish besides the fact that it has been tested on Windows and Linux, as well.
Code: https://github.com/kpocza/thriot
Documentation: http://portal.thriot.io/
Demo site: http://central.thriot.io/