KDocker has been discontinued. Similar apps include SmartSystemMenu, which is free and open source. Other options are RBTray, 4t Tray Minimizer, DM2 and The Wonderful Icon. You can choose from more than 10 Window Managers like KDocker for Windows, Linux and Mac.
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.
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EU