SEMS is a GPLv2+ media and application server for SIP based VoIP services. Basic applications like announcement, pre-call announcement, RBT, conference, voicemail, mailbox etc. and lots of example applications available.
My Media Box is a branch of Isaac Richard's MythTV project, aspiring to become a commercial quality set-top box. Our goal is to produce a non-corporate alternative, high-quality, media-server for a single, well-supported hardware platform.
the TivoConnect Media server implements version 1 of Tivo\'s Home Media protocol to allow Linux users to publish media to their TiVos. plans include a full protocol implementation and a full featured GUI. see www.tivo.com/developer for more