Media Browser Server is a media cataloging and transcoding server built on top of other popular open source technologies such as Service Stack, jQuery and jQuery mobile.
It features a REST-based api with built-in documention to facilitate plugin development.
We also have full .net and javascript wrappers around the api.
http://community.mediabrowser.tv/
Release: 3.0.4919.26112
Beta: 3.0.4927.41486
Dev: 3.0.4927.27789