Clicky Gone is described as 'Allows you to hide your selected windows from view, this includes the taskbar button associated with the application. This utility particularly helps with protecting your privacy by hiding things like your browser with banking details up and someone walks in on you' and is a Window Manager in the os & utilities category. There are more than 10 alternatives to Clicky Gone for a variety of platforms, including Windows, Linux, Thunderbird, X11 and SeaMonkey apps. The best Clicky Gone alternative is SmartSystemMenu, which is both free and Open Source. Other great apps like Clicky Gone are RBTray, KDocker, 4t Tray Minimizer and PS Tray Factory.
HMW is a free program to hide away the Windows on your desktop. With HMW you can set any program Window as hidden, while the program itself will run silently in the background. Additionally all the Hotkeys used can be customized to your needs.
Germany
EU
Stalonetray is a stand-alone system tray (notification area) for X Window System/X11. Working with virtually any EWMH-compliant window manager, it has minimal build and run-time dependencies (X11 lib only). Complete XEMBED support under development.
SilentRun is a small and handy Windows system software tool that can easily let you run multiple programs silently in the background. It can hide program windows and interfaces, and increase or decrease the priority of background processes.
China
MinimizeToTrayTool is a utility that allows the user to minimize any application to the Windows system tray with its icon.
Greece