Viper FTP is a handy and powerful file manager for macOS, with a tremendous user interface that makes it effortless to use.
ShareVault - ShareVault provides Virtual Data Rooms for secure document sharing during due diligence and other business critical processes.
FileZilla - FileZilla is an FTP, or file transfer protocol, client. It lets individuals transfer single files or batches to a web server. For many years, FTP was the standard for website design. Read more about FileZilla.
Drooms - Virtual data room software
Cyberduck - A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.
Dropbox DocSend - Dropbox DocSend is a secure file and document sharing solution that gives users analytics and control of document in their critical workflows. Key features include sending documents as secure links, eSignature, and customizable virtual data rooms.
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).