It's a mystery why Quod Libet is not a more popular media player. It's been around for years and the developers have constantly worked on it. The last major update was done back in May 2014, and the software is stable and full of goodies.
Quodlibet is a Latin phrase that means "what pleases" and it's used in music to describe a piece that's a combination of multiple melodies. The name seems to relate very well to the media player and it's actually quite catchy.