doubleTwist Sync is a new, lightweight iPhone Sync app for your Windows PC - the sync part of the OLD doubleTwist App.
https://www.doubletwist.com/desktopSync, made simple
Do you have music and videos on your PC? Maybe you use iTunes or Windows Media Player? doubleTwist Sync is a free companion app you can install on your computer to easily sync all your media – it even syncs back changed and new playlists! Syncing has never been this easy.
Ready, Set, Sync
That's the tutorial. doubleTwist Sync is a new, lightweight app for your PC to sync your music, videos and pictures over USB or over WiFi.
DOWNLOAD
Free. Windows only.
GOES BOTH WAYS
Sync bidirectionally (that's a fancy word for both ways) with iTunes! Change playlists on your device and have your changes reflected in your library after syncing. doubleTwist just got smarter!
FULL MTP SUPPORT
Works with devices like the Samsung Galaxy S3, Galaxy Note and Galaxy Nexus that require MTP support and cannot be mounted as a USB drive.
LIGHTER, FASTER
We've worked long and hard to make this version of doubleTwist the lightest and fastest at syncing and working with your devices. Better yet, it's simpler and easier to use than ever!
https://www.doubletwist.com/desktop