PhoneTrans

With PhoneTrans, you can manage the contents of your iPhone or iPad more freely than with iTunes since it allows you to manually add music.

It also lets you export the contents of your device directly to your hard drive, which is great if you want to back up your music or applications on a computer that doesn't have your iTunes library.

The interface is similar to that of iTunes itself, allowing you to browse the contents of your device. Everything is divided into Music, Videos, Applications, and Books, including a few buttons at the top for importing, exporting, and deleting content.

Without a doubt, PhoneTrans is a simple and less restrictive way to manage the content on your iPhone, iPad, or iPod Touch without having to sync iTunes or risk losing your content due to problems in its library.