Others support connection to third-party storage servers like Dropbox and Google Drive. Some of them can only transfer from local servers to online servers.
These are the features that you should take into consideration when looking for the best OSX FTP client. Most FTP clients have the same functionality and are quite similar, but sometimes you find a tiny feature in one of them that changes the whole idea of FTP and makes it more useful to you. Checklist - what to look for in the best FTP client for Mac?