Viper FTP is a handy and powerful file manager for macOS, with a tremendous user interface that makes it effortless to use.
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.
imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
Cyberduck - A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).
Sirv - Dynamic image processing, hosting and rich-media for retailers and eCommerce.