FOSS iTunes and instead of using iTunes as it’s music store, it uses the Ubuntu One Music Store by default. No DRM as far as I know, so you can do what you like with your music rather than being locked down to just using iThings.
It’s a bit simpler than iTunes actually (which is probably a good thing – old iTunes), you just have a list of all your music which you can play through. You can search/sort by Title, Artist, Album and Genre. You can control music with some basic controls in Ubuntu’s music pip which is very useful, as it means you can control anything ‘background’ in Ubuntu’s top-right system tray. You can (of course) also do the standard – playlists and suchlike.
The downsides are that you can’t play videos with it (it is a Music Player after all), and it doesn’t support particularly many formats, so you’ll want to have VLC installed alongside it, also, it only supports Linux-based operating systems (although I guess you could try to compile a OS X or a Windows one).
Usability: 8/10 (Great, other than the gripes above)
Aesthetics: 8/10 (Could have more integration of Album Art (pop-up while playing maybe) and it uses GNOME icons instead of (arguably the best) KDE Oxygen icons)
Performance: 9/10 (Can take a while to load but otherwise very good)
Overall: 8/10 (Solid program which could do with some polishing. This is YOUR Linux iTunes though)
Written by Adam.