GeeXboX, an opensource lightweight media center has uShare for Linux.

FUPPES supports a wide range of UPnP MediaRenderers as well as on-the-fly transcoding of various audio, video and image formats.

FUPPES, (website link just shows 'site will be back in a few days' at present) a free, open source, multiplatform UPnP A/V Media Server.

(FreeNAS UPnP server code is from the Portable Universal Plug and Play (UPnP) SDK project)

FreeNAS, a free operating-system/software (based on FreeBSD), enabling you to turn any x86-based computer into a dedicated stand-alone NAS (Network-Attached Storage) device.

eLyric by PS Audio is a free, uPNP media server designed for hi-res audio files up to 32 bits / 192kb streaming.It allows for UPnP streaming of recorded content.

Elgato EyeConnect, an OS X add-on for Elgato's EyeTV PVR application.DVBViewer Recording Service, an Windows application, mainly for TV/Radio recording/playback, but with the ability to stream live tv/radio as well as multimedia files via UPNP/DLNA.Also it can be integrated into Nautilus to browse and interact with other UPnP media servers. It can be easily enhanced with new backends to support Flickr, Gallery2, Last.fm etc. Coherence, a free and OpenSource UPnP/DLNA MediaServer based on Python and Twisted.It will offer a plugin architecture enabling new services such as Flickr to be added as UPnP services. BRisa, an open-source Python-based media server for Linux.Features album art, audio WAVE/LPCM transcoding from a huge range of audio codecs, replaygain support for streamed audio.

Asset UPnP/DLNA, Free Audio specific UPnP/DLNA server for Windows & Windows Home Server.Allegro Media Server, an iTunes to UPnP bridge server for Mac and Windows.It is capable of transcoding many non supported audio formats including AAC, Ogg, Flac as well as the formats the 360 already supports (MP3 and WMA). 360 Media Server, a UPnP media server designed for streaming music to the Xbox 360.Main article: Comparison of UPnP AV MediaServers

Dlna upnp player for mac