Qmmp
What is Qmmp?
Qmmp is an audio-player, written with help of Qt library. The user interface is similar to 
Winamp or xmms.
Extra features
XMMS and Winamp 2.x skins support
10-band equalizer
MP3, Vorbis, AAC, AAC+ streams support
MMS support (experimental)
MPRIS (1.0 and 2.0)
removable device detection (via HAL or UDisks)
video playback via Mplayer
lyrics (using lyrics.wikia.com)
cover art
CUE sheet support
embedded CUE support (for FLAC and WavPack)
multiple playlists
automatic charset detection for cue files and ShoutCast metadata
playlist formats: m3u, pls, xspf
ReplayGain support
Last.fm/Libre.fm scrobbler
CDDB support
stream browser
audio formats converter
external programs execution on track change
Winamp or xmms. Extra features
XMMS and Winamp 2.x skins support
10-band equalizer
MP3, Vorbis, AAC, AAC+ streams support
MMS support (experimental)
MPRIS (1.0 and 2.0)
removable device detection (via HAL or UDisks)
video playback via Mplayer
lyrics (using lyrics.wikia.com)
cover art
CUE sheet support
embedded CUE support (for FLAC and WavPack)
multiple playlists
automatic charset detection for cue files and ShoutCast metadata
playlist formats: m3u, pls, xspf
ReplayGain support
Last.fm/Libre.fm scrobbler
CDDB support
stream browser
audio formats converter
external programs execution on track change
Recent user activities on Qmmp
- OrdinaryAlien liked Qmmp
- jonatannyberg liked Qmmp
- deseven added Qmmp as alternative(s) to iCanHazMusic
It's not bad, definitely deserves more popularity. Winamp 2 skins support is a very cool feature, there's a decent number of other settings you'd typically expect from a good audio player. Some major downsides, however, are the lack of crossfeed (not crossfade) options and no encoder interface (aka converter).
Playback seems to stutter too at times, though increasing the buffer will help. On Windows, the volume can't be set if you use WASAPI output. You actually can enable software volume control, but that will lag, depending on your buffer settings.
There's still some good potential in this project. Would be nice to see it evolve even further.