Cyberduck

Link

client for Mac and [Windows](…/Microsoft Windows/) with support for FTP, SFTP, WebDAV, Amazon S3, OpenStack Swift, Backblaze B2, Microsoft Azure & OneDrive, Google Drive and Dropbox

Alternatives

Cyberduck CLI - command line access using the same protocols
rclone - [open source](…/open source/) CLI with support for more [operating systems](…/operating systems/) and protocols/providers
Mountain Duck - mounts using the same protocols as drives visible in Finder/[Explorer](…/Microsoft Windows/)