Remmina

Remmina is a remote desktop client written in GTK+, aiming to be useful for system administrators and travellers, who need to work with lots of remote computers in front of either large monitors or tiny netbooks.

Remmina supports multiple network protocols in an integrated and consistent user interface. The protocols currently supported are: RDP (Remote Desktop Protocol), VNC (Virtual Network Computing), NX (NoMachine NX / FreeNX), XDMCP (X Display Manager Control Protocol) and SSH (Secure Shell / Open SSH).

External plugins are also supported to add new protocols and features.