The Mac sync client for Windows Phone has received an update to support Windows Phone 8.1. Version 3.1.0, available now as a free download from the Mac App Store, also brings with it "various UI improvements" and drag-and-drop support for DNG files.
The Windows Phone sync app for OS X lets Mac users sync their iTunes libraries to their Windows Phones and import photos into iPhoto and Aperture, and opens up the media portions of the Windows Phone for browsing.
Mac users can grab the update to the Windows Phone app from the Mac App Store now.
Thanks, jwort93, for the tip!