Audacious, a descendant of XMMS is an opensource audio player that is low resource and has a minimal feature interface.
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Pro Streamlined player not weighed down by unnecessary options
Audacious is a classic music player at heart that has not felt the need to weigh itself down with an assortment of unnecessary options. Advanced functionality can be attained through plugins available from within the program.
Pro Tons of plugins
Pro Support for Winamp themes
Audacious can switch from its GTK interface to one that matches the looks of the famous Winamp player. What's even better is that this interface supports any Winamp themes, which allows for more options.
My audacious uses only 18.5 MB of RAM. It has a Winamp visualization style that's very minimized and convenient.
Con No bit perfect output
Audiophiles require this, and while most users might not notice a difference, audiophiles will appreciate the improved audio quality.
Con No manual sorting fields
There is no option to add one's own categories to the sorting fields.