CopyTrans Manager lets you move music from your computer to your iOS device without needing to go through iTunes in the process.

CopyTrans is a complete tool for creating full or selective backups of apps, photos, and videos from your iOS device to your computer.

Sharepod is an iPhone & iPad Music Transfer Software for Mac & PC.

Floola is a freeware application to efficiently manage your iPod or your Motorola mobile phone (any model supporting iTunes except iPhone, iPod touch).