The MiniUPnP project is a library and a daemon. The library is aimed to enable applications to use the capabilities of a UPnP Internet Gateway Device present on the network to forward ports. The daemon adds the UPnP Internet Gateway Device functionality to a NAT gateway running OpenBSD/NetBSD/FreeBSD/Solaris with PF/IPF or Linux 2.4.x/2.6.x with netfilter. One of its most interesting features is to enforce some permissions to allow or deny redirections, bringing some security to UPnP. Newer versions also support the NAT-PMP protocol from Apple.
PS3 Media Server is a DLNA compliant UPNP media server for the PlayStation 3. It is ready to launch and play. It has no codec packs to install. It does not require folder configuration and pre-parsing or any other annoying preparation. All your folders are directly browsed by the PS3, and folder displays are automatic refreshed. It also features real-time video transcoding of various formats, direct streaming of DTS/DTS-HD core to the receiver, remuxing H264/MPEG2 video and all audio tracks to AC3/DTS/LPCM in real time, full seeking support when transcoding, and much more.