SmartServiceProxy - aggregate semantic sensor data into representations of real-world things called Semantic Entities, and provide RESTful direct access to them. Not yet publicly accessible only because of privacy issues (sensor readings come directly from work offices). Check out more about it.
inContext-Sensing - application that generates annotations for provided sensor-related details, while using the SPITFIRE ontology. It is currently in a Beta release and it is accessible by either an HTML form or a REST API.