Air Explorer is available for Mac and includes the most important clouds of the moment. You can add accounts from Google Drive, Onedrive, Mega, Naver, etc. and you can also add accounts with S3, WebDav, SFTP and FTP protocols. Now we have added support for Aliyundrive and IDrive e2.
https://www.airexplorer.net/en/blog/air-explorer-for-mac-1-20-0-new-version/