DevStorm Apps has developed DSync 2.0, an update to their file synchronization software developed exclusively for Mac OS X.
The app integrates nicely with OS X 10.7 and higher, allowing you to select cloud folders in addition to local and network folders. Advanced algorithms in the latest version streamlines synchronizing large folders with many files, according to the folks at DevStorm Apps.
Sync costs $9.99. A demo is available for download (http://devstorm-apps.com/dsync/).