Deejayd is a multi purpose media player that can be completely controlled through the network using XML messages. It suppports playlists, searching, and many media tags. It can playback many music and video formats using either its xine backend (recommended) or its GStreamer backend.
Freeverb3 is a signal processing library. It includes many types of audio processing effects and signal generators including a linear feedback shift register (LFSR) maximum length sequence (MLS) generator, multiple types of high quality mono+stereo reverb effects, a multi slot impulse response processor, multiband hardknee+softknee compressor and limiter, a stereo enhancer, a limiter, and many types of infinite impulse respose (IIR) and finite impulse response (FIR) filters. Also available is Freeverb3VST, a VST effects plugins package based on the Freeverb3 library.
MPFC is a GStreamer-based audio player with a curses interface. It features support for all popular formats and output systems (by virtue of GStreamer), a standard playlist paradigm, windowed text user interface, full cue sheet support, integrated tags editor, a remote control for Android, and high configurability.
Musiql is a command-line front-end to MPlayer that provides SQL-based music library management features using SQLite. The project's goal is to provide a full set of music library management features without resorting to a menu-based interface. It imports music files into its database, extracting metadata from tags using Mutagen. SQL queries can then be used to retrieve lists of songs and play them in MPlayer. Static and dynamic playlists can be saved, and Musiql keeps track of play counts and ratings for each track.