The app is robust, connects seamlessly at startup and does not crash. The app can map cloud storage as a local drive as well as a folder on a local drive, thus obviating the need to have free drive letters. The app displays the amount of used and free space and makes it easy for the user to see how much storage is available on each cloud account.
RaiDrive - Mount NAS, Router, Google Drive, OneDrive and Dropbox to a network drive or file explorer.
GNOME Commander - GNOME Commander is a "two-pane" graphical file manager for the GNOME desktop environment.
Mountain Duck - Cyberduck for mounting volumes in the file explorer. Available for Mac and Windows.
FTP Synchronizer - Secure and high performance FTP File Sync product
Air Explorer - Air Explorer is a software to manage all your multiple cloud drives (like Dropbox, Onedrive, Google Drive, Mega, Mediafire, Box, Hidrive, Yandex, Baidu,...) as well as WebDav and FTP connections.
cryo - A visual file manager