Dropbox Folder Sync

Dropbox Folder Sync screenshots

It allows you to seamlessly sync folders outside the Dropbox folder

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.