The increasing popularity of programmable wireless networks has led to efforts by both industry as well as academia to redesign access networks based on the Open RAN concept, enabling a variety of novel use cases ranging from RAN sharing to enterprise wireless. This demonstration showcases our efforts relating to the design, development, and implementation of an O-RAN platform complete with a fully disaggregated radio access network and a near-real time network controller. Key highlights of this demo include O-RAN compliant network functions and interfaces based on purely open-source components, a new O-RAN service model to enable fine-grained control through network slicing, and novel statistics and configuration xApps supporting the proposed service model.