ForkLift one of the best FTP/SFTP clients and file management programs available for the Mac. With its fast, flexible, and friendly interface (especially elegant for an FTP program, with tabs, spring-loaded folders, and one- and two-pane options), Forklift delivers on two of the main criteria for an app of its kind: speed and ease of use.
This app is even faster now that it handles multiple channel transfers over remote connections, and a ton of powerful features can make your work flow easier, such as previewing, batch functions, any-to-any copying (between multiple different devices or sources), filters and favorites (excellent for grouping project resources), and a built-in Application Deleter. Forklift can also open in Terminal, and it can sync or merge the contents of two folders in different locations. Any professional who moves a lot of files around on a daily basis should try out Forklift's 15-day demo.