NoMachine is the fastest remote desktop package available today. It is used for both desktop and application virtualization and runs on Linux. The NoMachine clients are available for almost all operating systems: Windows, Mac and Linux desktops and also for the iPad, for example. Like many other Open Source packages, NoMachine works with a free download version and a subscription model for server Enterprise support. LinProfs is a partner of NoMachine, so extra discount on subscriptions can be obtained. NoMachine is a very good good alternative for Citrix, but does not run on Windows Server systems.