Rygel is a collection of DLNA (UPnP AV) services (devices in UPnP speak), implemented through a plug-in mechanism. UPnP in simplest words is a set of protocols that defines how different devices on a home network can seamlessly (without or with minimum configuration) communicate with each other.
... [More] UPnP AV defines how multimedia systems could be built on top of that. DLNA in simple words is a long list of rules that implementers must comply to if they want to achieve interoperability with other implementations in the market. [Less]
Coherence is a framework written in Python enabling your application to participate in digital living networks, at the moment primarily the UPnP universe. The main component is a DLNA Media Server, extensible via plugins.
Its objective and demand is to relieve your application from all the
... [More] membership/the UPnP related tasks as much as possible.
The core of Coherence provides a (hopefully complete) implementation of a SSDP server, a MSEARCH client, server and client for HTTP/SOAP requests, and server and client for Event Subscription and Notification (GENA). [Less]
dms is a UPnP DLNA "Digital Media Server". It runs from the terminal, and serves content directly from the filesystem from the working directory, or the path given. The SSDP component will broadcast and respond to requests on all available network interfaces.