MultCloud is a free Web based app that allows multiple cloud users to access all their online files from a single interface. And organize, transfer, sync or even manage sharing files between cloud storage services like Dropbox, Google Drive, Copy, OneDrive, FTP, WebDav, MEGA, etc. 26 cloud drives supported so far.

With the help of MultCloud, you can transfer files across cloud drives, do the centralized management and sync data between cloud storage services. And more, it is FREE, safe and reliable. 

https://www.multcloud.com