Mountain Duck Alternatives

Mount NAS, Router, Google Drive, OneDrive and Dropbox to a network drive or file explorer.

freemium

rsync for cloud storage.

A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.

ExpanDrive is a fast network drive and browser for cloud storage.

Cloud storage as hard disk

WebDrive File Access Client allows you to open and edit server-based files without the additional step of downloading the file.

paid Free Trial $59.95 / One-off

CloudMounter for Mac OS X: map Dropbox as network drive, mount OneDrive, Google Drive and Amazon S3; FTP client and WebDAV client.

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.

odrive aggregates all cloud storage. Access, sync, share, and encrypt everything in one place. Integrations to 20+ storage services, desktop sync, Linux support, placeholder files, zero-knowledge-encryption, web client, advanced sharing, and more!

freemium

Air Live Drive mounts cloud drives as local disks in your computer and open remote files with any application without having to sync or use local disk space. AirLiveDrive supports Google Drive, DropBox, OneDrive, Box, Mega, WebDAV, SFTP...

Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).

Use your home PC as your own personal cloud storage server.

With DirectNet Drive you can use the remote storage as a local drive: drag-n-drop the files in Windows Explorer, watch videos and play music in your favorite media player just directly from the FTP site.