Smitten differs from traditional media centres in three major ways. It contains no media playback at all, which makes it very small (and suitable for porting to embedded systems) and quick to initialize. It targets a TV display and interface, which means there's less information on any particular screen, and a much simpler control interface consisting of left, right, up, down, and select. No mouse is required. It is also highly skinnable, and cross-platform to most systems. Essentially, it provides an easy-to-use menu system that allows the user to navigate a hierarchy of files, and view them using an (external) tool.
pHash is an implementation of various perceptual hashing algorithms. A perceptual hash is a fingerprint of a multimedia file derived from various features from its content. Unlike cryptographic hash functions that rely on the avalanche effect of small changes in input leading to drastic changes in the output, perceptual hashes are "close" to one another if the features are similar. Potential applications include copyright protection, similarity searches for media files, or even digital forensics.
Coherence is a set of DLNA/UPnP devices, like MediaServer and MediaRenderer. In addition, it includes a well-designed framework to extend other applications with DLNA/UPnP functionality. It also has an emerging DBus API, enabling these applications to participate in digital living networks. It supports Playstation 3 (PS3), XBox, and many other devices.
Local Media Browser lets you access your collection of digital media files from a Web browser. It is designed for (but not limited to) low-powered clients (like the Nintendo Wii) on low-resolution displays (like TVs). It uses its own specialized Web server. It is fully customizable through easy HTML-templates, CSS, and ini-files. It currently supports picture and music files. It supports indexing and caching of information (such as thumbnails and ID3 tags) for fast browsing as well as on-the-fly gathering.
The MediaMVP Media Center (mvpmc) is a media player written in C. It currently runs on the Hauppauge MediaMVP hardware. It can play video (including live TV), audio (including live radio), show pictures, and retrieve Yahoo! weather. mvpmc can access media from a MythTV, ReplayTV, Hauppauge, VLC, or SqueezeCenter (aka SlimServer) server. It can also access media via UPNP, HTTP, NFS, and CIFS. There is a VNC viewer built in. It understands MPEG1 and MPEG2 video, MP3, OGG, WAV, AC3, and FLAC audio and JPG, BMP, and PNG images.