There's
Songbird, too, but as soon as you want to manage other-than-music on your iDevice, you need iTunes. You *can* just do it all over wifi and never touch itunes, but I have found (yes even on my mac) that there can be pitfalls with that (for example, a failed iOS update which left my iPad unusable until I plugged it in and restored it via iTunes). I also use iTunes and my computer for backups in preference to iCloud. But thats just me.
If you have an idevice and nothing has ever gone wrong with it through *not* using iTunes, you're lucky.