xmms-shn is an input plugin to play shorten (.shn) files in XMMS. It supports real-time seeking via the seek extensions built into shorten 3.x. Shorten is an audio compression format developed by SoftSound, and is used extensively in the distribution of losslessly-compressed live music.
xwax allows DJs and turntablists to playback digital audio files controlled using normal turntables via timecoded vinyl. It handles needle drops, pitch changes, scratching, spinbacks, and rewinds, making it a capable tool for beat-mixing and scratch-mixing. It focuses on an accurate vinyl feel that is efficient, stable, and fast.
zgsmplay is a curses-based realtime GSM file player with file selector. (GSM is a lossy sound compression format used for speech.) In addition to simply playing the files, zgsmplay lets you move around them, etc., and can cope with large samples. A copy of Jutta Degener and Carsten Bormann's free GSM compressor/library is included.
zlplay is an MP3 player that uses the zlcatalog system to organize songs. zlcatalog is a library for organizing things in non-hierarchical ways. Songs in zlplay can belong to multiple groups. Navigation through the groups shows songs and related groups. So, for example, it's very easy to start listening to all of your songs randomly and then when you hear a song by a particular artist, a single click switches the song list to songs by that artist.