Dropbox Folder Sync

Dropbox Folder Sync screenshots

It allows you to seamlessly sync folders outside the Dropbox folder
Dropbox Folder Sync 2.5 : Main window

Alternative downloads

Allway Sync
Synchronize data between PCs, USB drives, network, and online storage.
ShareFile Enterprise Sync
A tool for scheduled folder syncing between your PC and your account.
CodeTwo Exchange Sync
Exchange Sync is an application enabling automatic synchronization of data.