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If you are interested in a program to manage and synchronize all your files in multiple clouds (Dropbox, OneDrive, Google Drive, etc.) you can try Air Explorer

Air Explorer is an application that manages easily all files in multiple cloud servers (Google Drive, OneDrive, Dropbox, Mega, Box, Mail.ru, WebDAV, Yandex, Baidu, FTP...). It transfers files between the clouds, synchronizes folders between any cloud or your computer and, optionally can encrypt your files when you upload them to the cloud.

If you want to mount your clouds as disk drives in Windows you can Air Live Drive

Air Live Drive mounts cloud drives as local disks in your computer so you can open remote files with any application without having to synchronize or using local disk space. Air Live Drive supports the most important clouds as OneDrive, OneDrive for Business, Google Drive, Box, Dropbox, Mega, Yandex, Naver, Hidrive, Mail.ru, WebDAV, Mail.com, Adrive, Magenta Cloud, Stack Storage, Datto Drive and SFTP.