Is a complete GUI replacement for the gnome terminal which allows you to manage your connections, cluster mode (for sending commands for several servers at the same time) and support for ssh, ftp, telnet, vnc and rdesktop.
Do you have to connect to a lot of systems, using ssh, telnet, vnc and/or rdesktop? The Connection Manager lets you configure all of these connections, and access them by name, so you aren't forced to remember how to connect to each system.