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.

Swinsian is an advanced music player and manager for Mac OS X supporting FLAC, MP3, Vorbis, WMA and more.

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).