UPnP AV

More information: Wikipedia:UPnP AV MediaServers

Universal Plug and Play AV servers allow you to host content across a network for other UPnP-aware devices (e.g., Xbox 360s, etc.)

SimpleCenter

This is a Java-based UPnP AV server. It supports Windows XP and Vista.

Once installed, you can set up folders for it to automatically catalog.

More Information

• http://www.rbgrn.net/blog/2007/08/how-to-choose-dlna-media-server-software-in-windows-mac-os-x-or-linux.html