Remmina is a remote desktop client for Linux

Linux

Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...

-based operating systems, written in C, that supports the RDP

RDP

RDP may refer to:* Radiodifusão Portuguesa, a subsidiary of Rádio e Televisão de Portugal* Rally for Democracy and Progress, a generic name for a multi-national political party* Rassemblement Démocratique et Populaire...

, VNC, NX

NX technology

NX technology is a computer program that handles remote X Window System connections, and attempts to greatly improve on the performance of the native X display protocol to the point that it can be usable over a slow link such as a dial-up modem...

, XDMCP and SSH

SSH

- In science and technology :* Saffir–Simpson Hurricane Scale* Sea surface height, the topography of the ocean surface* Secure Shell, a network protocol for remote administration of Unix computers* Social sciences and humanities, a broad field of research...

 protocols. It is in the package repositories for Debian

Debian

Debian is a computer operating system composed of software packages released as free and open source software primarily under the GNU General Public License along with other free software licenses. Debian GNU/Linux, which includes the GNU OS tools and Linux kernel, is a popular and influential...

 versions 6 (Squeeze) and later and for Ubuntu versions since 10.04 (Lucid Lynx). As of 11.04 (Natty Narwhal), it replaced tsclient

Tsclient

tsclient is a frontend for rdesktop and other remote desktop tools, which allow remotely controlling one computer from another. It is a GNOME application...

as the default remote desktop client.