Noatun is a media player of KDE

KDE

KDE is an international free software community producing an integrated set of cross-platform applications designed to run on Linux, FreeBSD, Microsoft Windows, Solaris and Mac OS X systems...

. It supports various formats, including (Ogg)Vorbis

Vorbis

Vorbis is a free software / open source project headed by the Xiph.Org Foundation . The project produces an audio format specification and software implementation for lossy audio compression...

 and WAV

WAV

Waveform Audio File Format , is a Microsoft and IBM audio file format standard for storing an audio bitstream on PCs...

.

Noatun is available as free software

Free software

Free software, software libre or libre software is software that can be used, studied, and modified without restriction, and which can be copied and redistributed in modified or unmodified form either without restriction, or with restrictions that only ensure that further recipients can also do...

 under the terms of a BSD style license.

The Noatun player is very modular and uses aRts

ARts

aRts, which stands for analog Real time synthesizer, is an audio framework that is no longer under development. It is best known for previously being used in KDE to simulate an analog synthesizer....

 as backend.
It is fully skinnable (supporting classic Winamp

Winamp

Winamp is a media player for Windows-based PCs and Android devices, written by Nullsoft, now a subsidiary of AOL. It is proprietary freeware/shareware, multi-format, extensible with plug-ins and skins, and is noted for its graphical sound visualization, playlist, and media library features.Winamp...

, XMMS

XMMS

The X Multimedia System is a free audio player for Unix-like systems.-History:XMMS was originally written as X11Amp by Peter and Mikael Alm in November 1997. The player was made to resemble Winamp, which was first released in May that year. As such, XMMS has supported Winamp 2 "classic" skins...

 and KJöfol skins among others), and can be expanded using plugins, which add functionality such as visualization

Software visualization

Software visualization is the static or animated 2-D or 3-D visual representation of information about software systems based on their structure, size, history, or behavior....

s.

Noatun was the media player of the KDE project till it was replaced in KDE4 and discontinued.