Apollo

When it comes to choosing an audio player, there are users who focus on the aspect of its interface, demanding skins and all that make it look better, and others who prefer sound quality and efficiency over aesthetics.

If you are among the latter group, this program can become your favorite. Apollo is a straightforward music player for Windows, that stands out for its excellent audio quality and the functions it offers in spite of its simplicity. The slogan that describes it is very accurate: “Sound quality is not skinnable”.
It natively supports MP3 and WAV, and also a wide range of other formats through different plug-ins, including ALAC, FLAC, CD Reader, WMA, or OGG.
The interface is very very simple, but has all the essential functions allowing us to fully enjoy our music. Among them we find a realtime 16-band equalizer, the ability to create playlists, with drag and drop functionality and advanced options, Internet streaming, WAV decoder, just to mention a few. In addition, it has support for general purpose plug-ins to enhance its functionality, more specifically, it supports 2.xx plug-ins used by Winamp, for example the ones used to synchronize the player with services like LastFM, or visualization plug-ins.
Apart from that, the window can be minimized to the system tray, or used in mini mode occupying a very small portion of your desk and still with all the basic controls at hand.
The application is very small in size (1.19MB), and does not consume considerable system resources. Another aspect to highlight is its detailed and comprehensive HTML documentation.
Unfortunately, as of 2007 its developer announced that further development has been discontinued. Still, we can freely download the latest and old versions of the program from the site.