Viper FTP is a handy and powerful file manager for macOS, with a tremendous user interface that makes it effortless to use.
Plupload - Multiple file upload utility using Flash, Silverlight, Google Gears, HTML5 or BrowserPlus!
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.
FancyUpload - digitarald:Harald K - Consultant & Contractor - FancyUpload - Swiff meets Ajax - Swiff meets Ajax for powerful and elegant uploads.
Cyberduck - A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.
Fine Uploader - Javascript plugin tool to give your users a smooth experience when uploading files to your website.
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).