A remote desktop client for the GNOME desktop environment
KRDC
KRDC is a client application that allows you to view or even control the desktop session on another machine that is running a compatible server. VNC and RDP is supported.
Krfb Desktop Sharing
Krfb Desktop Sharing is a server application that allows you to share your current session with a user on another machine, who can use a VNC client to view or even control the desktop.
Remmina
Use other desktops remotely, from a tiny screen or large monitors.