The Spice Project

Taken from Spice Project Site

The Spice project aims to provide a complete open source solution for interaction with virtualized desktop devices.The Spice project deals with both the virtualized devices and the front-end. Interaction between front-end and back-end is done using VD-Interfaces. The VD-Interfaces (VDI) enable both ends of the solution to be easily utilized by a third-party component. ces (VDI) enable both ends of the solution to be easily utilized by a third-party component.

The Spice project plans to provide additional solutions, including:

1. Remote access for a physical machine
2. VM front-end for local users (i.e., render on and share devices of the same physical machine)

Downloads:

1.  Client Downloads

SPICE - Simple Protocol for Independent Computing Environments

According to wikipedia,

In computing, SPICE (the Simple Protocol for Independent Computing Environments) is a remote-display system built for virtual environments which allows users to view a computing "desktop" environment - not only on its computer-server machine, but also from anywhere on the Internet and using a wide variety of machine architectures.

There is a good writeup of some observation of SPICE usage experiences and performance and comments on other remote protocol. do read Taking SPICE for a Spin