Many iTunes alternatives have been shared on this blog but what else can be better then managing and syncing music on your portable devices from popular multimedia player Winamp, the good news is that the latest version of Winamp comes with built-in support for importing iTunes database and playlists with full featured portable device management and synchronization functionality offering seamless integration with iPod (Shuffle, Video, Nano & Classic), Creative Nomad/Zen/MuVo, PlaysForSure (P4S), USB Thumbdrive and ActiveSync devices, for enabling iTunes support simply check the Import iTunes Tool option while installing Winamp and follow the guide ahead to work with iTunes and iPod from within Winamp.
Using Winamp to sync your iPod devices ensures that you don't need to worry about losing songs when syncing on different computers.