FTP Clients common to Ubuntu/Mint in conventional repositories include: Gftp, Vsftp, Lftp, Git-ftp, Inetutils-ftp, Jftp, Ncftp
Some are console based and some run in X.
Many File Managers for Linux have built in FTP support and work as a full FTP client.
FireZilla
gFTP
gFTP is a free/open-source multithreaded File Transfer Protocol client program. It is most used on Unix-like systems, such as Linux, Mac OS X and Sony PlayStation 3. It includes both a graphical user interface (GUI), which utilizes the GTK+ graphical toolkit, and a command-line interface.
Supports bookmarks
GNOME Commander
This just crashes when attempted to add an FTP site to connect to.