cipricus

Extremely light (around 20 MB of RAM in Lubuntu 12.04) but extremely powerful and stable. Can be used with or without install (static/portable). Not as many addons/plugins as foobar2000, but there are some good ones like Infobar (song's lyrics; artist's biography) and File Browser. The later is excellent in accessing music database without any increase in memory use (better than Foobar in this sense!). A sound converter is included if codecs are installed. Can switch between GTK2 and GTK3 interface. Playlists in multiple tabs (foobar-like); editable colors.