Amarok is an almost free, open source, cross-platform media player. It is available for Windows, Mac OS X, and Linux and UNIX computers. It will play FLAC, WAV, and MP3 files. The FLAC format is becoming quite popular because it gives you WAV quality in files that are one-third the size of WAV files. It also supports metadata.
The original author of Amarok was Mark Kretschmann. The first release was in 2003. The current release is version 2.4.3. It is licensed through GNU Public License Version 2. Amarok was developed for the KDE free software community, but is released independently of it. The word Amarok comes from the Inuktitut word for wolf, explaining the wolf logo it uses. I was not able to download it until I made a small contribution of $10 to the organization. The amount you donate is up to you though.
The screenshot below shows what the Amarok interface looks like.
After I installed it I uploaded one of my playlists from iTunes to it and it played with no problems. One thing I find a bit awkward is the volume control, a little wheel you have to drag to adjust.
The website where you download Amarok warns you that the latest Windows version is not a stable release. I suppose I should not be surprised that it just crashed on my computer. They are working on a stable release for Windows though.