Is there a cloud client for Android with specific folder synchronization?

Question

Android

You need to synchronize with Android only a specific folder.
So they know how to dropsync for money and sugarsync also for money.
I want it for free. There are options?

Answer 1

dropsync
Free of charge one folder like is able.
It costs a penny - you can buy it.

Answer 2

I myself use BTSync, but it is not cloudy. It is synchronized with your own computer, for example, or a server with an installed client.